Our automotive engine carbon cleaning removers contain sodium gluconate and sodium tripolyphosphate. It can deeply remove carbon, improve fuel efficiency, and make the engine power as strong as before. Its use is simple: when the fuel gauge shows 1/4, introduce this product into the fuel tank. Drive 30-50 kilometers to fully blend the product with fuel. Fill the fuel tank after driving and complete the cleaning process. And it can reduce carbon deposition, ensure full combustion of gasoline, and save fuel costs.