How to get window tint off my back car window?

I bought a car in another state and it had dark window tint on it. the side window tint came off just fine but the rear window would not. the tint came off but the adhesive is still there, its not sticky but baked on there. i have tryed every chemical possible, even acetone. i need it to wipe off bc i dont want to destroy the defroster strips. can someone give me any ideas? thanks.|||Take it to a professional tinting place and have them take it off for a fee!!