On untinted windows, I've used the Invisible Glass spray from Stoner (aerosol can with the yellow top). On the tint, I've wiped them with simple water, then followed that with a dry microfiber cloth.[/b]
Back on topic now, this worked great. Used it before the shoot. Got all the streaks out and annoying film. For now. When I got my windows tinted they said for the first 2 weeks to just clean with water and after that I could use any cleaner on them. Still look the same after 3 yrs.
Except for the driver side.
It has a green tint when your inside looking out. But thats beause someone broke into my car to steal CD's (most which were in Greek) and the body shop used different stuff. The insurance wouldn't let me take it to the place I orginally got the tint. They said the shop is taking care of it. Oh well, it looks the same from the outside.