Fast and easy in application: after just 15 minutes and without effort the vehicle is operational again. Deep within every A/C unit many micro-organisms such as yeasts, bacteria and fungi have found their perfect habitat. The consequences are nasty odours and even the occurrence of serious allergies. The use of conventional disinfectants will kill a maximum of 99.9% of the bacteria, the surviving 0.1% will reproduce themselves millions of times over in just a few hours. multi-resistant germs killer.. Read Less