KOCH CHEMIE Reactive Rust Remover Rrr, 500 ml

Acid-free rust remover.
This powerful neutral pH cleaner is made with reactive agents and highly effective detergents. Surface rust, metal particles, brake dust and other inorganic contaminants are removed quickly and thoroughly. Gentle on materials. The ingredients are matched for a longer contact/wet time so that the reactive agents can effectively dissolve stubborn stains and other particles. The cleaner turns purple when the dirt has dissolved. The special surfactants in the formula coat and disperse partially dissolved dirt, making it easy to wash away.
Spray the product undiluted onto the surface and allow to soak in for approximately three to six minutes. Finish with a brush or sponge if necessary. Rinse thoroughly.
Do not use on hot surfaces. Do not allow to dry.