Take a black plastic garbage bag and cut it open, take a spray bottle and fill it with water and little dish soap and spray the back window (on the inside over the tint) and spread the garbage bag over it and try to get most of the air out and let it sit in the sun for about 30min and re-wet it and let it soak for another 15 to 20 min and peel a corner of the film down and slowly pull it off. It should all come off depending how bad it is. After you get the film off take the soap and water and spray the glue while the window is still hot for best results and use a piece of steel wool, green umbrello pad, sos pad, or something like that and scrub all the glue until all the glue is off the window.
If the glue is hard to get off you might try some 409 or simple green cleaner but that will make it messier.
I have been tinting for about 5 years and that is how we do it; hope this helps.
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