Gum-Solve Carburetor and Choke Cleaner helps restore carburetor performance by removing gum, varnish, carbon deposits and dirt build-up. Cleans and frees linkages, cables, and actuators, fuel injection intake systems and PVC valves. Gum-Solve is safe for oxygen sensors and catalytic convertors. It is not recommended for use on plastic parts or painted surfaces. 50 state formula.