Originally Posted by RPRacing

take some mildly diluted ammonia, 5:1 (ammonia to water). spray the windows that you want the tint off of. put black plastic trash bags on the window as if you were gluing them to the window. covering as much as you can. leave the car on full blast heat and set it in the sun for a couple hours. come back and you'll notice how easy the tint film comes off. the reason for the heat (as long as you pull the film off slow when you go to remove it) is that it makes the glue really soft so you have much less (glue) to scrape and steel wool once the film is all off.