There is one important thing to know about using metal blades on glass surfaces. Without learning it, you can scratch the glass unless you get to understand and remember it. It is a must to use a cloth soaked in soapy water, or a soapy spray, to keep the glass surface wet. You must keep the glass slippery and wet while having the metal blade in contact with it, otherwise, you will scratch it. If the car is yours, you'll be angry about it. If it is a client's auto mobile, they'll gladly ask you to replace the glass window. Either way, you won't like it
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Another good thing with not being able to use heat in the process of removing the adhesive graphics is that you won't need any glue remover solution. The blade alone will scrape off the adhesive glue and the sticker.