Briggs & Stratton Pressure Washer Hydrofoam Wash - 24 oz 6092 HydroFoam Wash - 24 Fl. Oz. To be used with the HydroFoam Launcher One Gallon of Concentrate Cleans Four Average Cars or 800 Sq. Ft. of Siding, Decking, and Concrete Concentrate makes 1 gallon