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Best way is to use a clothes steamer. See videos on YouTube. Depending what tint your removing.
If you don't have one or don't want to buy one use a heat gun and try to get as much up then razor blade and elbow grease. I eventually had to pull my windshield tint off my raptor.
Bored police were pulling me over so figured best just to remove it. (I knew most of them or they know my brother.)Wasn't going to risk my dash to the steamer for obvious reasons and had to use heatgun, razor blade and acetone. Sucked big time!!
It's not bad at all. Get black trashbags cut them to the shape of the window. Spray the inside of the window down with soapy water. Put the trash bag over the window tint. Park in the sun. Wait 15 minutes and it will peel off like butter. I've done it on 2 of my cars and have ever had any leftover residue either.