Overtime, a vehicles engine becomes covered with gum, varnish and dirt build-up. Gumout Regane Parts Cleaner/Degreaser cleans and degreases all unpainted metal parts, carburetors, chokes, intakes, throttle bodies, brake drums, brake rotors and calipers. This professional strength formula contains Polyetheramine (P.E.A.), the most potent cleaning agent on the market that attacks unwanted deposits.