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Gasoline and alcohol. Although it has a certain corrosiveness on the façade paint, it will not have a great effect. Gasoline is better. Dip a clean rag in some gasoline and rub the façade!
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Doesn't it seem like it's okay to drop?
You can find a place that is already a little up, and apply some wind oil essence (or other oily liquid objects) to the place where it is connected to the door, peel it a little more, and then peel it again, and so on several times, and then it will get better and better to peel, be patient! >>>More
If it is not good to tear, you can use a hair dryer to heat the side of the file to blow and tear!
Go buy a plasticizer and spray it, it will foam in ten minutes, it will be torn off, and then wipe it clean with water.
The situation that the protective film on the security door is aged and needs to be removed can be solved in different ways: >>>More
First find a corner of the edge of the protective film from the top of the door, and then carefully lift the corner of the protective film little by little, and then pull down little by little in the form of a diagonal according to the shape of the door, the force can not be too large, to ensure that the protective film will not be torn, the force should be even, if you accidentally tear it, find another corner, tear it in this way, and know that the surface of the door is smooth.