Gumout Carb/Choke Cleaner Jet Spray is a maintenance aerosol. Cleans gum, dirt and varnish off the outside of the carburetor and the inside of the carburetor throat. It helps overcome hard starting, rough idling, stalling, and high exhaust emissions. Gumout Car/Choke Cleaner is a 50 state, Volatile Organic Compounds (VOC) compliant formulation.