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A trick I've used for a while and always works is 1) take off as much of the sticker as you can with a non-aggressive tool or your fingers. 2) soak a paper towel sheet and then "slap" it onto the glass where the sticker is affixed. Wait about 10 mins, and then the rest of the residue/sticker will easily roll off. This technique is a little messy and wet, but it doesn't require anything besides water and a piece of paper towel.
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