Cataclean For Petrol Engines Works By Dissolving Carbon Deposits And Other Contaminants Through Out The Fuel And Exhaust System,Including The Fuel Tank,Fuel Injectors,Oxygen Sensors And Catalytic Converter. After Being Poured Into The Fuel Tank It Is Carried Through The System With Fuel.When Combusted It Creates An Acidic Vapour That Cleans The Exhaust Components,Particularly The Catalytic Converter,By Breaking Down Thw Carbon Build Up And Improving Its Ability To Reduce Harmfull Emisions.It'sability To Reduce Harmful Emissions. It Also Reduces The Particullates In Petrol Particulate Filters,Preventing Clogging.