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If you don't need to do a full cleaning of your deck, but you see an excess buildup of algae or dirt, you can make a more concentrated paste with your bleach. Simply add a little water to some oxygen bleach powder and mix the solution together with a spoon until it forms a thick paste. Apply the paste to the dirty areas of your deck with a nylon brush and let it sit for 15 minutes before thoroughly rinsing it off. Pour one cup (200 g) of borax into the bucket with your bleach and water solution. Mix it together while wearing gloves and target specific areas on your deck where mildew has formed. Borax can typically be found in the laundry detergent aisle of the grocery store and is a mineral compound that won't destroy your nearby plants. Power washers can sometimes be too powerful and could damage the wood forever. Instead of using a power washer, use a pressurized adjustment on your hose or a lighter pressure spray machine. Never use chlorine bleach to wash your deck. Chlorine bleach is toxic to plant life, can discolor your wood, and reduces the integrity of the wood.

Summary:
Create an oxygen bleach paste to spot clean your deck. Add borax to your deck cleaning mixture to remove mildew. Don't use power washers or chlorine bleach to wash your deck.