Evapo-Rust is a soak solution that eliminates flash rust in as little as 10 minutes, and deep rust in hours. Non-caustic, non-acidic, it requires no special equipment or protective clothes. Evapo-Rust is reusable and in most cases can be discarded to a sewer. Product is safe for many metals and will not remove non-oxide coatings. Daubert Cromwell, Alsip, IL