There are many ways. For example, wiping the film off with lacquer thinner or heating it with electric hair drier. We used electric hair drier. It works well. We also used alcohol when we tear off the third layer of film. The effect is good too.
There are many ways:
1. If the film is not too big, you can apply some lacquer thinner to it and then scrub it with cleaning ball. 2. Detergent used in textile industry will work (Bottled such detergent is called al). I've tried it. It really works well. 3. Use sulfuric acid. But you should mix it with water before use, otherwise the door will corrode. Immerge the door into the mixed sulfuric acid for a period of time and scrub it with cleaning ball. 4. Firstly, use electric hair drier to blow the film. And them slowly tear it off or scratch it off with wooden shovel. The glue marks can be cleaned by solvent oil.
