I'm sorry, I know this is resurrected, but I needed to tell you the right way. I've worked in tinting for MANY MANY years and this is how to do it with no hassle, no mess....
Spray the entire tinting surface with Windex, something with AMMONIA... then lay a giant garbage bag against the entire surface of tint. Wait an hour or two. The ammonia will soak through the tint, dissolving the adhesive and the tint will peel right off with the giant garbage bag.
Steam on the edge of the window for 10-15 seconds to start it, and once it begins to peel, slowly peel it back and continue to steam the area where the adhesive is pulling up. I've helped a few friends remove their tint this way, and they all swear by it.
Plus, you don't have to worry about a razor blade cutting the rear defroster wires.
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