Our glass oil film cleaner contains tetrafluoroethylene. It can quickly clean the glass surface and remove stubborn stains from the car without damaging the glass making it transparent and clean. Its usage method is very simple: Method one is to apply this product on the surface first then wipe it back and forth with a towel until the glass is clean and then rinse it clean with clear water. Method two is to open the wiper reservoir pour this product into it add an appropriate amount of water dilute it and then open the wiper to directly clean the glass. After use it can efficiently remove stubborn oil films on the vehicle ensuring the glass is clean and clear providing a clear view and enhancing driving safety.