Cataclean is a fuel and exhaust system cleaner designed to improve engine performance and reduce emissions. Marketed as an engine and catalytic converter treatment, Cataclean's liquid formula is poured into the fuel tank, where it cleans and removes carbon deposits from the fuel system, injectors, and catalytic converter. This cleaner aims to enhance fuel combustion efficiency, potentially boosting horsepower, improving fuel economy, and extending the life of the catalytic converter. Catering to both gasoline and diesel engines, Cataclean is often used as a preventative maintenance solution to address carbon buildup and optimize overall engine function.