How to remove deck stain properly from your wood before reapplying.
No matter how well you protect your stained deck, you may eventually have to strip and restain the wood. If you choose to change the color or brand of stain on your deck, you will have to strip it before applying the new stain or sealer. A stripper makes it easier to remove the old stain by weakening the bond between the stain and wood particles. The old stain can then be easily removed by using a pressure washer or scrub brush.
Note: See here if you need to remove a Difficult to Remove Deck or Wood Stain.