ZEP All-in-1 Pressure Wash Concentrate features a super-strong, fast-acting formula that makes up to 26 Gallons. This efficient all-in-1 concentrate removes dirt, grease, oil, grime, road film and stains caused by algae, mold and mildew. This product is formulated for use on vinyl, wood, brick, stucco, concrete, tile, stone, metal and plastics. Cleans driveways, decks and patio furniture. Removes stains caused by algae, mold and mildew. For use on vinyl, brick, stucco, wood, concrete, cement, asphalt, fiberglass, tile, stone, metal, plastics and vehicles. Not for use on deteriorated surfaces like old wood and paint unless you intend to refinish surface. Concentrated formula makes up to 26 Gal. For use with pressure wash machines. Dilute 6 oz. per gallon of water (1:20), for heavier stains use 25 oz. per gallon of water (1:5). Includes four 172 oz. containers.