This liquid compound can be added to a soak tank to soften and facilitate removal of carbon, gum and other surface contaminants from automotive pistons, carburetors, fuel pumps. Also great for engine assemblies that have been pre-cleaned with degreasing solvent. This ready-to-use cleaning agent contains monoethenolamine and ethers. Does not remove rust or corrosion. Caution: Avoid contact with skin. P-C-111 Type I.