ACP-II is extremely effective in removing grime and the dust encrusted on engines and other areas that have a thick build-up of iron oxide soil. Unlike most acid cleaners, ACP-II is safe for use on polycarbonate windows which are now installed in railway vehicles and boats. ACP-II is effective for cleaning food plant equipment, bins, chutes, air conditioners and chiller coils and tanks followed by a potable water rinse.