How to Clean a Wood Deck The first step in cleaning your wood deck is to sweep it off to remove any loose dirt or debris. Next, mix 1 cup of TSP (trisodium phosphate) per gallon of hot water and use a garden hose to clean the deck. Be sure to rinse the deck thoroughly with clean water after you finish cleaning it with the TSP solution. To protect your wood deck from weathering and staining, you can seal it with a coat of sealant or stain. Be sure to follow the manufacturer's instructions for application.

To clean your wood deck, use a deck cleaner that is specifically designed for wood decks. Follow the manufacturer's instructions for using the cleaner. Once the deck has been cleaned, apply a sealant or coating to protect it from moisture and staining. Consult with your local hardware store or home improvement center for recommendations on the best sealant or coating to use on your particular type of wood deck.