ISO-HEET® brand contains isopropanol and special gas additives including Fuel Injector Cleaner. When ISO-HEET® brand is added to the fuel tank, this formula remains in the solution with the gasoline, and absorbs five times more than regular gas-line antifreeze. Any water in the gas tank mixes with the ISO-HEET® brand, preventing the water from freezing in winter. ISO-HEET® brand also removes water and condensation in warm, wet weather. Then the entire mixture of gasoline, ISO-HEET® brand and water are burned during combustion inside the engine. ISO-HEET® brand cleans fuel injectors and carburetors for fast starts and smooth-running engines year round.