So we just bought a new car, and because of the fact that it was raining when I test drove it, I didn't realize the rear window was blurry to look through due to some aftermarket tinting. There was some tint on the other windows as well, which was in poor shape, so I asked the dealer to take it all off.
Long story short, they took off everything but the very rear window. Argh. Apparently they don't want the liability of scraping off the rear window defrost and radio antennae that is essentially painted onto the inside of the rear window, now underneath some crapy plastic tinting. When they do the other windows they use a razor to get the tint off, which obviously won't do here.
So I read up on the possibility of doing it here and there online, and essentially everyone advocated steaming it off. Unfortunately this sounded arduous and also mostly require a nice hot sunny day. Sort of out season here...
Finally I found "Removing tint; the not messy, easy, cheap way." It advocates using a cheap hand clothes steamer. I got mine at Rite Aid for $20.
About an hour later, of using the steam to get the glue to release from the glass, but remain on the plastic tint, I had one sheet of tint outside my car and off the window. It was REALLY easy and I didn't even stand a chance of harming the defroster and antennae. Not to mention, it was a pretty much flawless job, with the exception of a few square inches of glue I left on the window, which the steamer also helped get right off.
Another hour later, I cleaned up the job they did removing the tint, removing a few stray pieces, and using the steamer to remove the glue they left, where it didn't all tear off properly. Also vacuumed.