Karcher KD-420 Coil Cleaner Powder Concentrate, 2 pound, case of 12- 2 LB

KD-420 is a powerful, acid-based coil cleaner that effectively attacks rust and hard water deposits in pressure washer hot water coils. KD-420 does not contain mineral acids, such as hydrochloric (muriatic), sulfuric and hydrofluoric acids that are commonly used in other coil conditioners. Even though it is acid-based, KD-420 is formulated so it can safely pass through a pressure washer without damaging the high-pressure pump. Do NOT use on aluminum or tin.