What cleaning agent is used to clean the dirt and carbon deposit inside the engine?

At present, a Tongyong universal water-based decarbonization agent is very popular all over the country, and it is sold in 4S shops, which is absolutely guaranteed. If you use detergent, the wear will be very severe, which is no different from poisoning. Don't try it. . The safety of water-based decarbonization agent is much higher than that of water-based decarbonization agent. The oil circuit, intake and exhaust are all disassembly-free and cleaning-free, and the combustion chamber can be cleaned only by disassembling the spark plug. . If you are interested, go to the 4S shop and ask. .