Gumout 800002230 Carb and Choke Cleaner, 16 oz. Helps overcome hard starting, rough idling, stalling, and high exhaust emissions Quickly removes deposits from the inside and outside of the carburetor to improve engine performance and fuel economy Cleans gum, varnish, and dirt from clogged carburetors and choke valves Effectively cleans unpainted metal parts and is quick drying