Easily prep your deck for resurfacing with RockSolid Deck & Concrete Cleaner. This concentrated solution quickly and safely restores dirty, weathered, and mildew stained wood to a bright, natural look. Size: 1 gallon For use on wood decks, siding, and fences; composite decks, and porous concrete surfaces Fast acting Removes dirt, mildew, algae, and more Eliminates mill glaze Covers up to 2500 square feet per gallon. Preparation Remove any loose paint. Secure raised nails. Sweep the surface of all dirt, dust, and debris. Application Mix two cups of concentrate (16 oz.) with 1 gallon of water (1:8 mix ratio). Apply the cleaner to decks and patios using a deck brush or pump sprayer. Allow the cleaner to sit for 5-10 minutes. Rinse off with fresh water. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov