Gumout 14 oz. Jet Spray Carburetor & Choke Cleaner. It cleans the outside of the carburetor and the inside of the carburetor throat, removing gum, varnish, and dirt buildup. It also cleans PVC valves and helps relieve hard starting, rough idling, stalling, high exhaust emissions, gasoline waste, and loss of pep. VOC compliant in restricted areas.