I removed window tint on a truck of mine a few years back, I bought a "Window Tint Removing Kit" from Autozone or PepBoys. It included a razor blade holder, a couple of blades, a cloth, and window tint adhesive remover. The kit was under $10. You had to peel the film off, and then of course the window is covered in the sticky leftover adhesive. Spray the adhesive remover on the window, let it sit for about 10 minutes, then it comes off REALLY easy with the razor blade and then clean up with the cloth.