Step 5 · Scrub the Deck

After allowing the deck cleaner to sit for the time recommended by the manufacturer (usually 10-15 minutes), use a stiff-bristled scrub brush or a deck brush attachment for a power washer to scrub the surface. Work in the direction of the wood grain to effectively loosen embedded dirt, mold, mildew, and algae. Ensure you scrub all areas, paying extra attention to heavily soiled spots.