Zep, 128 OZ, House & Siding Wash, For Use On Vinyl Siding, Hard Coat Stucco, Brick, Wood & Aluminum Siding, Removes Dirt, Algae, Mold Mildew & Grease, Concentrate Makes Up To 20 Gallon, For Use In Pressure Wash Machines, Covers Up To 5,000 SQFT.