Zep 128 oz. Driveway & Concrete Pressure Wash is a concentrated cleaner for use on concrete, brick, aggregate, and asphalt surfaces. It makes up to 20 Gallons and is used with pressure washing equipment for fast and thorough cleaning. It removes dirt, stains, grime, and oil, while restoring the original look of concrete. It is not for use on painted, sealed, or stained surfaces that will not be refinished.