The Rislone Cat Complete Fuel, Exhaust, and Emissions System Cleaner helps customers pass emissions smog tests, turn off check engine lights, clear OBD codes, improve vehicle performance, and save gas. The cleaner is added to a half-tank of gas to clean the vehicle’s entire fuel, exhaust, and emissions system. The product uses a proprietary blend of heavy duty detergents and solvents to remove contaminants, soot, carbon build-up, and oily residue from the fuel injectors, combustion chambers, turbo, catalytic converters, oxygen sensors, and exhaust. Other chemical ingredients react with the gases created in the combustion process to remove remaining inorganic deposits.