Factory tint does not come off. Secondary market comes off using a straight edge razor, you can buy a pack at most hardware stores.

When I removed the tint from my Jeep, I started the peel at one corner with a razor blade until I could grab it with my fingers. Then I just peeled it off slowly.

Try it first on the driver's side rear window. The tint should not be all of the way at the top, so roll the window down about an inch and start peeling. When the top of the window is peeled down enough, roll the window up to the max and continue peeling down as far as it will go.

Interesting that it is fogging up. They usually don't do that. If the install was bad, they just bubble up.

Klaus
--
Always willing to listen, just not able to take direction.