Quote Quoting Who'sThatGuy
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If you use the razor blade the correct way, it will not do any damage to the window. Motor Vehicle Inspection stations use a razor blade on a handle to remove expired inspection stickers from windows on thousands of cars everyday without damaging a window. When your vehicle is impounded by the police they write on the windshield with a crayon type marker that you need a razor blade to remove. Painters use it on windows all day long. I have never seen a windshield damaged by the razor blade. If you are going to dig into a window with a razor blade, then yes you will damage the window. Hold the razor blade at an angle and you will not..
That is why I recommend against it. Someone who doesn't know what they are doing can do damage. There are enough other ways to do it that are safer.