Google ed china terraclean and have a read or watch his videos. Basically its a chemical that was originally engineered as an alternative fuel, but it was deemed non viable due to cost. However during all the research it was discovered that the engines it was tested on were restored to a very clean state and were decarbonised etc. As such it was reengineered as a cleaning product for the fuel system. I believe it works by positive and negative particles affecting each other and causing the breakdown. It is said to clean the fuel system, injectors and cat etc as it works its way out through the exhaust system. Its scientifically proven to work.