In the Rotunda and Miller systems and others like them, Autocare AUT024 is mixed with gasoline the fuel system is disconnected from the engine, and the cleaning mixture is recirculated throughout the fuel system. These systems are in wide use today in Europe, Mexico, South America, Central America, the Caribbean and Canada as well as the USA. (By omission, Eastern Europe should be a prospective, growing market.) A fuel injector cleaning system was subsequently developed which injects the cleaning liquid directly in the fuel injector rail through a fast-unload valve on an aerosol can. These systems are found most often in auto dealerships.