Starbrite - Star Tron Ring Clean+ Star Tron Enzyme Formula Ring Clean+ is formulated with the latest technology for deposit control, plus a proprietary enzyme package designed to remove the toughest deposits while helping to prevent the formation of new deposits. Ring Clean+ removes deposits from fuel injectors, carburetors, intake valves, intake ports, and combustion chambers that can lead to engine knock, stuck piston rings, dirty spark plugs, lost power, decreased performance and reduced fuel efficiency. Formulated to work in all boat, motorcycle, car, truck and outdoor power equipment engines.. Size - 16 oz (473 ml) 2 Pack Formulated with the latest technology in deposit control compounds, plus a proprietary enzyme package designed to remove existing deposits and help prevent the formation of new deposits. Improves fuel combustibility to keep engines clean and operating at peak performance levels Ideal for removing deposits caused by regular gas and ethanol-blends Keeps carburetors