(TBC) throttal body cleaner: this powerful formulation of concentrated solvents is specially formulated to remove dirt; carbon, gum and varnish deposits that tend to build up on the moving & sealing surfaces of engine carburetors, heat values & automatic chokes, throttle bodies, pcv valves & linkages. Our product helps to free sticky valves, struck heat risers and throttle linkages. Periodic use on cars, trucks, airplanes, boats, lawnmowers etc., will keep engines clean, fuel efficient and trouble free. Applications: remove air intake tube; spray throttle body cleaner in and around throttle plate clean excess carbon and resin using a cloth. Start engine and allow to run at high rpm.