NGEN THE NEXT GENERATION™ LIQUIFOG™. This is forone (1) case of six (6 ) bottles of NGEN LiquiFog™ GDI Fuel System Cleaner (Made in USA). NGEN's revolutionary and proprietary formula, LiquiFog™, unleashes a new Carbon Crusher™ thermally stable and fogging chemistry that safely and thoroughly cleans these deposits in just one tank of gasoline.