- Sweep away debris and wet the deck surface and spray surrounding vegetation with a garden hose (figure A).
- Mix 1 cup of TSP (trisodium phosphate) and 1 gallon oxygen type bleach solution with 1 gallon of hot water. Use less water if the deck is really dirty.
- Apply with a scrub brush or a stiff bristled broom, keeping the deck wet while applying the cleaning solution. Let the cleaning solution soak, then rinse off with a hose (figure B).
- When the deck is dry, consider applying a wood finish, which is different from a surface sealer. A wood finish penetrates deep into the wood grain, guards against moisture damage and protects the wood from harmful UV rays, which prematurely fade and age wood.
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