Formula 21 All Purpose Cleaner is the “Purple” All-Purpose Cleaner and Degreaser is a super-concentrated cleaner/degreaser. Fast-acting, biodegradable, water-based blend of chelating salts and grease-cutting agents. United States Department of Agriculture (USDA) authorized for use in federally inspected meat and poultry plants. THIS PRODUCT CLEANS VIRTUALLY ANYTHING! Formulated to clean away grease, grime, and dirt on contact. Light cleaning can dilute 10/1.