Our automotive catalytic converter cleaner is carefully formulated with polyetheramine and dodecane. It is specifically designed to effectively remove carbon deposits inside the engine, restore engine power, help reduce vehicle emissions, and make driving more environmentally friendly. The usage is extremely convenient: 1. Add this product to the fuel tank before refueling, then fill the tank. 2. Vehicles that haven't been cleaned for a long time may emit black smoke during the initial cleaning process; this is a result of removing a large amount of carbon deposits. Afterwards, during the normal cleaning phase, the black smoke will decrease and disappear. 3. We recommend cleaning and maintenance every 5000 kilometers. For vehicles that haven't been cleaned for a long time, we recommend using this product twice consecutively. 4. Do not clean in the following situations: The catalytic converter is burned out due to high temperature or lead poisoning; the catalytic converter is severely clogged; or the engine is leaking oil. It can only be used again after treatment. Furthermore, it can improve fuel combustion efficiency, save fuel consumption, protect key engine components, and extend their service life.