Our metal rust remover is carefully formulated with polyethylene glycol-400 and fatty alcohol polyether-9. Designed specifically for removing stubborn rust. The usage method is extremely convenient: Gently shake the rust remover bottle, evenly spray the rust remover onto the rust on the metal surface, rinse with clean water to loosen the rust, or wipe the surface with a clean damp cloth. And it can quickly remove rust and scale, saving time and energy.