Koch Chemie Reactive Rust Remover (Rrr) is powerful, pH-neutral rust stain cleaner made from reactive substances and special surfactants. The removal of rust stains, metal granules, encrusted brake dust, and other inorganic dirt is quick, thorough, and does not harm the material. The reactive substances infiltrate the adherent and encrusted particles in order to effectively dissolve them because the optimal coordination of the ingredients ensures a lengthy contact and hydration time. The violet color reaction shows that the dirt is breaking down. The product's surfactants simply permit rinsing by encasing and dispersing the dissolved dirt.