Mold and Mildew on Wood Decks 4.4/5 (34)

by Barry Maddox

This post was updated on May 26, 2022

Mold and Mildew on Wood Decks

Deckstainhelp.com is your number one source for deck staining tips and trends on the internet in 2020. Mold and mildew can appear on your wood decks, see below for why this happens and what you can do to prevent it. Leave us a comment if you’ve encountered mold and mildew on wood decks.


Black Mildew Deck

Black Mildew Deck

One of the most common natural occurrences that plague decks are mold and mildew. Mold is the term that most people refer to when they see green algae, moss, lichen, and fungal growth. Mildew on decks is commonly seen as small black spots that can be embedded in the wood or an old stain. Without getting too technical, mold is a good general term for explaining this nasty contaminant that is seen growing on decks all across the country. One deck may be more prone to mold than another deck depending on its location. Climate, region, shade, sun exposure, and humidity all play a part in the mold and fungal growth. In fact, some deck stains are even more prone to mold than others.

Mold on decks can cause a variety of problems. Obviously, unsightly appearance is one major concern. There is nothing worse than a green deck floor that is suffering from mold issues. Mold can also be treacherous to walk on especially when wet. Mold and fungal growth are very slippery and have no place on deck flooring or steps. You might as well put out a “slippery when wet” sign to keep from getting sued. To be serious though it can be extremely dangerous. Some of the other not so commonly known problems with mold are wood rot and decay. Mold can only survive when it has enough moisture. This constant moisture wreaks havoc on a deck’s surface. The damage can be superficial or can go as far as to cause major structural damage.

Mold and mildew on decks will also eat through and deteriorate deck stains that are there to protect the wood. Mold on decks is not a unique situation, it is rather common so do not be worried if it has happened to your deck. The good news is that mold/mildew can be cleaned off of wood before it does harm. Most wooden decks should be cleaned and re-stained every 1-2 years as maintenance. Regular cleaning with a deck cleaner will help ensure that mold/mildew does not infiltrate your deck in any form. Another way to combat mold on decks is to apply a mold-resistant deck stain or sealer. A deck stain that combines trans-oxide pigments or mildewcides will help you win the war with mold/mildew on decks.

Mildew On Deck Stain Photos

Written By: Barry Maddox ~ Midwest Pro Wash

Please Rate This. You may also post comments or ask questions below.

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Jim
Jim
1 month ago

I recently stained my new deck with a water-based stain. Within the last few weeks it’s rained a significant amount with high humidity and the entire deck has turned brownish black. I attempted to spray my typical deck mildew remover, but it didn’t work nearly as well as it did prior to my staining the deck. I’m not sure what to do. I thought the purpose of staining a deck was to be able to protect the wood and easily remove mildew. This mildew seems to have seeped into the stain. Any help?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Jim

Post some pics and what stain brand did you use?

Gordon
Gordon
1 month ago

My old redwood deck has become unstable because many of the board ends have rotted. So I removed the deck boards, and found that the pressure treated framing is still good, and most of the decking lumber is ok too. Just the ends are rotten, and the sides of many boards have a bit of rot too.

I think that most of the redwood decking is still serviceable though, and I plan to re-use it, minus the ends.

Is there anything I can do to protect the sides of the boards from rot? For example, could I treat the sides and ends of the boards with copper-green brown before installation, then prep & seal the top surface with Armstrong Clark semi-trans? Would that significantly extend the service life of the reclaimed redwood decking?

Last edited 1 month ago by Gordon
Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Gordon

No that will not work and you nothing you add at the ends will give longer life or protect from rot.

Gordon
Gordon
1 month ago

Thanks Scott. Do you recommend treating cut ends of pressure treated decking during installation?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Gordon

No need. Never does anything.

Christy
Christy
1 month ago

We have a mahogany porch that was installed 6-8 weeks ago. I am now seeing a significant amount of what appears to me mold spots. Could this happen so quickly if they properly stained/ sealed the porch?
Thanks
Christy

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Christy

Yes, it can happen but it also could be rust.

Teresa
Teresa
10 months ago

We had a new redwood deck built, completed about 8 days ago. Two days ago blue-ish/grayish spots started appearing (see photo). Is this mildew? What do we do? Do we use a product now to clean it off and keep cleaning periodically until it is time to stain it? Do we wait until spring to stain it? We are in Northern California.

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
10 months ago
Reply to  Teresa

Looks like rust from the building process. Prep and stain in Spring.
https://www.deckstainhelp.com/remove-rust-black-stains-from-deck/

Katie
Katie
1 year ago

Hi all! We just had a new deck put on with treated lumber. Maybe 3 weeks old. I just noticed we have one board with what I think is mildew spots? My builder said it happens and it will sand off. Is this true?

I can’t wipe it or scrub anything off. It appears embedded in the wood. The deck is not stained. Any suggestions? Should I worry ?

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Katie

It is rust or mildew and will come off when you clean and brighten the deck for prep prior to staining.

Claire J
Claire J
1 year ago

We started building a raised platform playhouse in about April 2021. The posts are rated for ground contact. The deck boards and wall studs are pressure treated. However, after a wet summer here in Austin, TX, my spouse now realizes the beams under the deck (1×6 & 1×8 ? joists) are not pressure treated. Mold spots are everywhere since the joists are shaded by the deck. I’ve cleaned Olympic Premium Deck Cleaner and started staining the pressure treated parts and the outside facing parts of the untreated wood that are cleaned and now don’t have mildew spots. I’m really struggling to totally eliminate the mold stains under the deck, though, and I don’t know how pristine it has to be before applying solid stain. Thanks for any guidance!

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Claire J

You will need bleach to kill the mildew spores.

Tom
Tom
1 year ago

I stained over spotty black mold on an exterior deck now it’s peeling! Big surprise , that’s hat happens when cutting corners. I knew it as soon as I finished. There are areas that are not peeling up and am afraid pressure washing isn’t going to do it. Any suggestions to get me out of this mess? Thvx

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Tom

Post some pictures.

Jenica
Jenica
1 year ago

Hello
1) 2year old deck cedar
2)
3) Yes we are switching brands
4)Coloverdale oil based
5)
6) We have old and mildew issues
7) we ordered this wood perstained and we think it had a mold issue prior to arriving
8) we are having it sanded and wonder if the mold or mildew issue will be removed with the sanding or if we should still treat the wood before we put a sealer on? It has been recommended to use a diluted vinegar Oxi clean and borax solution any thoughts? We live on waterfront property with a lot of trees, we also have a shake roof.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Jenica

We would need to see pictures posted here for prep help.

Jenica
Jenica
1 year ago

Picture of our deck

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Jenica

Strip and brighten this wood for pep using Restore A Deck Kits. it will prep it for restaining and will kill the mildew: https://www.deckstainhelp.com/restore-a-deck-injectable-deck-stain-stripper-review/

Dana
Dana
1 year ago

After cleaning wooden deck steps of mold and mildew, is there a non slip paint or oil you recommend for rainy and snowy conditions?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Dana

You want a penetrating stain for this so it is not slippery. Any of these will work: https://www.deckstainhelp.com/the-5-best-deck-stain-reviews-and-ratings/

Dana
Dana
1 year ago

Thanks for the quick response. Does adding sand or other additive help? I have 15 steps up to my front door in rainy Seattle so a lot of opportunities to slip and fall. I saw a UK product by Osmo that seems to be for grip but can’t find an equivalent in the US.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Dana

You cannot add a sand or additive into a penetrating stain.

Linda
Linda
1 year ago

Seeking advice re: deck built in mid-2016 as a part of our new construction condo. We were new dummy homeowners and regrettably did not have the knowledge or time to stain the deck – so it’s in some dire need of TLC. There is quite a bit of mildew/algae as the backyard does not receive any sunlight, and we’re hoping to clean and stain it for the first time ASAP. Would really appreciate any advice on the process to take and products to use, as well as any tips for ongoing maintenance afterward.

About the deck:

  • ~5 year-old pressure-treated pine
  • never stained
  • no direct sunlight, lots of humidity and rain (also no ventilation underneath)
  • you can see that the floor is the worst victim of moisture
  • need to remove mildew/algae and prevention as well
  • a dog who tends to scratch up the deck

We prefer natural/transparent colors but will honestly use whatever works best for the ongoing moisture/algae and scratching issues.

Thank you so much! This website has been a lifesaver!

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Linda

For prep, try the Restore A Deck Cleaner and Brightener kits. For stain you want a deep penetrating stain. Try TWP or Armstrong Clark brands.

Linda
Linda
1 year ago

Thanks! Should I use a water-based or oil due to the moisture/mildew?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Linda

Either.

fisher gabriele
fisher gabriele
1 year ago

I just had my entire deck rebuild with pressure treated wood. staining was followed up with a semi transparent stain from CABOT. Now after 2 weeks mildew spots are forming under the stain. We tried to wash and sand the spots out but they seem to be deep in the wood and not near the wood surface. Do you know what might have happened? We did have a lot of rain during the building process. I’m wondering if my deck builder stained the wood too early before letting it dry out completely or was the wood from the get go not still green ? My deck is huge and it was expensive to rebuild ,power washed and stained. What can I do now???I’m miserable. Please let me know what I can do to get rid of the mildew spots …more and more are showing up every day. I so appreciate any input and advice.
Thank You, Gabriele Fisher

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin

You will need to strip it all off and let the wood properly weather. Once that is done, clean and brighten for prep before staining.

Kristen Owens
Kristen Owens
1 year ago

We had a brand new deck built May. We waited until the wood was ready to apply Thompson’s water seal. Now this is what I have on both my swing and porch. What do we do??

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Kristen Owens

You will need to remove it. Strip and brighten with Restore A Deck Stripper/Brightener kits.

Kristen Owens
Kristen Owens
1 year ago

What does it look like happened?

Kristen Owens
Kristen Owens
1 year ago
Reply to  Kristen Owens

And how do you remove it? Strip?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Kristen Owens

Yes, as we mentioned in our reply.

Yasmeen
Yasmeen
2 years ago

In southern Oklahoma…. Installed deck back in July 2020. Was getting ready to stain, but discovered this on the untreated wood. From what I gather here, we need to strip and clean with wood cleaner, correct?

I see lots of mentions of waiting until Spring, but not sure I understand why. Won’t it spread much more by then? Any advice?

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Yasmeen

It is mildew and it will come off with a good deck cleaner and wood brightener. See here about new wood: https://www.deckstainhelp.com/staining-a-new-deck/

You can do it in the Spring.

Yasmeen
Yasmeen
2 years ago

Ok so should we not stain it now to prevent more mildew? OR should we stain over it now then clean, brighten and stain again in spring?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Yasmeen

Just do it all in the Spring.

Bob Hour
Bob Hour
2 years ago

Just installed raw cedar decking ( three weeks since received from the mill). Just before the job was finished it rained. Now I have small black mold dots on quite a few of the cedar boards. I was told it had to season for a few months before before the semitransparent finish was to be applied. What should I do? Should I just use a mold remover next spring just before staining?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Bob Hour

Strip and brighten in the Spring. Stain again.

Bob Hour
Bob Hour
2 years ago

There is no finish on the cedar, just newly installed I was going to wait till next spring after seasoning the wood. Not sure what you mean by strip? Should I deal with the mildew next spring?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Bob Hour

Sorry, wait until Spring, and then clean and brighten for prep before staining.

Scott
Scott
2 years ago

Im getting ready to stain a solid wood stain (defy) on a approximately 3 year old front covered porch and vertical outside of an uncovered back deck. The back deck has heavy black spots on it. I used RAD cleaner/brightener on both. The black spots on the rear deck didn’t really come off. Any suggestions on what I should do now? I’d really like to stain these this weekend? The covered front porch picture shows a deck with cleaner only and one with brightener. Thanks

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Scott
Scott
2 years ago
Reply to  Scott

Neither has ever been stained/sealed, etc. The rear horizontals are Trex.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Scott

You could try some watered down bleach to kill the deep mildew in the wood. Make sure to rinse well when done. 1 part bleach to 4 parts water.

Scott
Scott
2 years ago

I did use a bleach water mix after sending the pictures, it did help some, but didn’t remove it completely. I rinsed it and then respirated with brightener and rinsed. Hopefully the Defy will cover it well and it won’t have any peeling issues.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Scott

It will be fine.

Jessica
Jessica
2 years ago

Hi, we installed our new red cedar deck a week ago. It rained last night for the first time and we woke up to this?? We have a tree near by and we also just installed an aluminum gazebo so not sure if that as anything to do with it? I tried wiping it but it doesn’t come up. It’s kind of all over, but more so up agaisnt the house in this corner. I’ve ordered the Armstrong Clark kit with the cleaner and brightener. We are in southern Ontario so we probably won’t be getting it for a while – is there anything we need to do in the meantime?? Will the cleaner and brightener take it away? Is it mold? Thanks in advance!

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Jessica

The prep will remove it but you cannot stain this new deck yet: https://www.deckstainhelp.com/staining-a-new-deck/

Jessica
Jessica
2 years ago

Okay, thanks! It’s kiln dried and we are planning to wait, just not sure how long the stain will take to get here. The article says not to sand new wood, but we have a few rough spots on the fencing which is cedar too, should we sand that? Just not the floor boards if I’m understanding correctly.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Jessica

Being kiln dried you still have to wait. If you need to sand then sand now.

Tara Tomita
Tara Tomita
2 years ago

Hello,

We recently built our deck just a couple of months ago. It is pressure treated pine. We let it weather for about 6 weeks, cleaned it with Cabot problem solver wood cleaner, sanded with 60 grit paper (I now realize we did this backwards) and then applied Cabot Australian Timber oil-based stain. Just a few days after staining, the deck is covered in little black spots which appear to be mold/mildew. We live in Hawaii.

1. Do you think it is because of the oil based stain or because we cleaned before and not after sanding?

2. Also, regrettably, we applied epoxy bondo wood filler to cracks. Any suggestions on how to remove this?

3. Would cleaning and brightening remove the black spots? Or do you suggest stripping first with RAD and pressure washing it off? Then sanding if needed? If we need to sand, do we then clean and brighten, and wait 48 hours, before applying the RAD stain?

I wished we would have come across your site beforehand!
Thank you!!

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Tara Tomita

That is mildew or rust. Did any metal get on the wood? Steel wool, etc? Either way it has to be stripped off and started over. Brightener as well. The only way to remove the wood filler is to scrape or pry it out.

DOROTHY Paynes
DOROTHY Paynes
2 years ago

In early 1918 I had a deck built. I paid for kdat . now the wood is black and moldy looking on the banister and deck floor . Is this dangerous ? If so ,how?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  DOROTHY Paynes

Yes, you should remove the mildew. Use the Restore A Deck Cleaner and then Brightener: https://www.deckstainhelp.com/restore-a-deck-cleaner-system-review/

After, stain with Defy Extreme Stain or Restore A Deck Wood stains.

Cassie Williamson
Cassie Williamson
3 years ago

Hello, I have a 4 year old deck. We live in GA. Our deck gets decent sun light for about 6 hours a day. We had it stained with a solid stain 6 months after being built. The stain failed and was peeling up and also had mold and mildew issues within a year. We are wondering if the wood was not treated properly before staining (proper wash and brightening). So we sanded the deck down to the raw wood with a grinder made to remove failed finishes…See pics

now for my questions….

1) we plan on now using a quality cleaner and brightener. My husband feels that the mold and mildew spores are down in the wood so he thinks we should brighten first to open the pores back up and then clean the deck so that the cleaner can get down in there to kill the spores down in the wood… AND then brighten again. What are your thoughts on doing this?

2) If we dont do that, and just clean and brighten as is normal but still see some of these spores down in the wood wont they just continue to grow and spread under the new stain? We plan on staining with a semi transparent water based stain.

2)Also, what is your opinion of the product called Wet and forget it?

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin

1. Yes, clean and brighten the wood. Not a double brightener. Doing that first would have no effect.
2. Possibly but hard to say for certain.
3. Use this after can help mildew from coming back.

MR.P.
MR.P.
3 years ago

I just built a 45′ wood ramp. I need clear wood sealer for my handicap ramp that will be anti-slip/skid.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  MR.P.
John
John
3 years ago

I’ve been cleaning and cleaning but not luck removing the mildew(?).

First I used Valspar All-In-One Deck prep per instructions and scrubbed with a stiff brush. Then I did the same with Wet and Forget and so no improvement…yesterday, I used Biokleen Oxygen Bleach powder twice. I’ve still got black spots on the deck.

I’d read that power washing would destroy the soft wood particles and shorten the life of the deck. But, after reading your great site, I think that a pressure washer is the way to go.

I’ve scrubbed and scrubbed with no luck. What should I do next?

Great site. Thank you!

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  John

For one, you need to strip and brighten this deck, not clean to remove the old red stain. This may also help with the mildew issue. Looks at the RAD products with the Stripper additives: https://www.deckstainhelp.com/restore-a-deck-stain-stripper-booster-thickening-gel-review/

You apply and then pressure was off.

If that does not get it all off, bleach is your last resort. we do not like to use bleach but sometimes you have no choice. Mix 1 part bleach to 4 parts water. Apply, let sit for 20 minutes, then rinse well.

Sterling
Sterling
3 years ago

I have treated mildew on our wood deck with 1/2 strength vinegar and dish soap, but staining remains. Does this mean the mildew has not been killed or will the stain remain anyway? Should I treat it with something else before applying the oil/stain?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Sterling

Post a picture.

Chuck
Chuck
3 years ago

Love the website. Ready for stain. What is the best mold resistant stain with trans-oxides or mildewcides ?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Chuck

Look at TWP 100 Series or Restore A Deck Wood Stains.

Linda Lohman
Linda Lohman
3 years ago

Our deck is in the NC mountains. It’s very moist.lots of green mold/mildew. Which deck stain/paint would be the best?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Linda Lohman

Has it been stained or painted before?

Vikki Delpercio
Vikki Delpercio
3 years ago

due to low funds we had to deck our deck with plywood, there are a few areas that have a greenish grow of algae or moss or lichen. How could I clean this off and what could I seal it with to prevent or slow down future growth. Need this to last 20 months until I can replace with deck boards.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin

Use Restore A Deck Cleaner/Brightener kits and the Restore A Deck Stain in Natural.

Kathy in OK
Kathy in OK
4 years ago

Do you recommend deck over products?
We are getting our house for sale.

William R Krueger
William R Krueger
4 years ago

What are the best deck stains to inhibit mold and mildew?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin

Defy Extreme or Restore A Deck Wood Stains.

William R Krueger
William R Krueger
4 years ago

Is Cabot any good?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin

Used to be. They then sold the company and changed all the formulas.

Nano
Nano
4 years ago

Is it necessary to use cleaner and brightener on new cedar deck that has seasoned if it isn’t that dirty?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Nano

Yes. You have to remove the mill glaze.

Lucas
Lucas
4 years ago

Is this mold/mildew on our Redwood deck? At first I thought it was pollen and dirt that got stuck to the old stain which then turned black from sun exposure, but after doing a bleach spot test in the corner and seeing the bleach uncover the wood underneath, I thought it must be mold/mildew. So I tried the OxyClean method with power washing it off, but that did not work. Maybe I didn’t make the OxyClean mix it strong enough. When dried, the black stuff is hard as a rock and almost looks like the wood is burnt/charred. What would you suggest to the black out? Will restore a deck really do that?

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Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Lucas

It does not look like mildew. Maybe old deck stain that has turned black? A good deck stripper and pressure washing should remove it.

Lucas
Lucas
4 years ago

It turns out they sprayed our deck with Thompson’s water seal, which contains paraffin (wax). Although oil based, normal deck strippers won’t get the paraffin off apparently. An “award winning deck contractor” (so he said) said you can dilute ammonia 4:1 to get Thompson’s water seal off. Not sure ammonia is good for redwood and might cause discoloration (not that its a new deck by any means). Otherwise purchase a hydrocarbon remover. Any product you know of designed specifically for removal of paraffin containing deck sealers?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Lucas

You can strip it off. Use any deck stain stripper followed by a wood brightener. We do it all the time.

Holly Mureiko
Holly Mureiko
4 years ago

My deck surrounds a pool, so there are places that are prone to growing algae. I used the Restore-A-Deck cleaner MULTIPLE times (spray cleaner, let sit, scrub, repeat) and it still has a slight green tint when wet and is very slippery in those spots. It looks great when it’s dry. Should I do something more to make sure the algae is truly gone before I apply the brightener and stain?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Holly Mureiko

That means it is embedded in the wood It will not come out when deep in the wood nor should it show when the stain is applied and dried.

Mossetta Rollins
Mossetta Rollins
4 years ago

Is twp mildew resistant?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin

Yes. It contains an EPA registered mildewcide.

Richard
Richard
4 years ago

Our Cape Breton, Nova Scotia cabin has clear white pine siding. It sits in a spruce and hardwood forest. The siding was last refinished 7 years ago. Evidently there was not enough or any mold resistant additive in the stain and hence there is tremendous blacking. Last summer we tried using a Behr Wood Stripper to clean things up with poor results. We resigned that we would need to sand all surfaces this season – given all the surfaces of the trim details, this will be an extensive procedure. Is there any other wood stripper you have some confidence would give good results in removing the extensive blackening or is sanding the way?

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Richard

What stain did you use and please post some pictures?

Gwen
Gwen
4 years ago

Reading this background AFTER doing the following: pressure washing the hell out of the mildew etc, including both black and green coverage; stained deck with Cabot Decking Stain 1400 Clear (leftover cans from construction 10 years ago). It rained about 8 hours later, still raining. I also have pressure washed the back steps and railings, and in both cases I know I was taking off splinters of wood, but that was what I had to do to get rid of 10 years of neglect. Now I am trying to learn how to care for my home by myself. Here is a photo of the process and the before photos. After photos are irrelevant until it stops raining.

Strip of Clean the Deck
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Brian
Brian
5 years ago

I recently replaced a lot of old damaged boards on my deck. The stripping agent I bought from Lowe’s did not do anything. My power washer removed more old stain by itself than when I used the cleanser. I have completely power washed the entire deck. I have a couple of questions:
1. Can I just use a professional sander to sand down the deck and then stain it after that? Or do I have to use the restore-a-deck solution stripper and restorer and power wash again before sanding?
2. When using that sanding machine I am going to need to roll over the new replacement boards while sanding the “old boards” -is it ok to use the sander machine on the new boards or will that damage them? If so, how do I get around the sandpaper touching the new boards-do I have to sand those “in between” old boards by hand?
Thanks for your help.

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  Brian

Post a picture.

m gilbert
m gilbert
5 years ago

I started with plain water, pressure washing, then applied the Restore a Deck cleaner, soaked & scrubbed as directed. However, before I was able to follow up with the brightener, got called away. So it has dried.
(It is a deck in the shade nearly all day). It is now clean & ‘white’ but we still have noticeable green color to about 1/3 of the boards (algae?).
1) should we re-apply some cleaner again, before using the brightener?
OR
2) it looks like we will have to re-stain, as about 50% of the stain from last yr (Big Box Store brand) has worn away on the horizontal surfaces, so should we just proceed with using the stripping RAD product at this point instead?
Thank you
Margaret

Scott Paul ~ Restoring Wood & Decks Since 1993
Admin
Reply to  m gilbert

Strip and then brighten would be your best course of action at this point.

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