Prime 823 rapidly attacks a wide variety of greasy soils, inks, adhesives, and uncured polymers. It also rinses easily in water leaving behind a surface that is totally film-free. It’s safe for use on most common metals and is an excellent choice for hot water high-pressure washers for engine, heavy equipment, and general cleaning prior to steam phosphatizing. Prime 823 is 100% active and 100% biodegradable.