Krud Kutter Deck and Fence Pressure Washer Concentrate is the ultimate deck and fence cleaner. This proprietary formulation of Krud Kutter contains a proprietary additive which removes tough stains from mildew, mold, algae, fungus and moss, and restores the original look to wood decks and fences. Also dissolves stains from dirt, oil, grease, bird droppings, tree sap, and acid rain. Removes mold and mildew stains from wood, fences, decks, including composite decks. Makes 11 Gallons and cleans up to 3,200 Sq Ft, Water based, biodegradable. Work in small sections and allow product to penetrate for 3 - 5 Minutes. Do not allow product to dry on surface.