So, I had my windows tinted about 6 months ago, and when the temps started rising this summer, I began getting some nasty grease marks (vertical) that are only in one spot of the window. I called the window tint place, and they have no clue what it would be. I stopped at the dealer, and they weren’t sure, other than maybe a roller that had grease on it making contact with it. However, they would need the car for a few hours to take everything apart and take a look. I plan on doing that at this point, but has anyone ever experienced this before? If so, what was it causing the problems? The grease marks do wipe right off, but it’s annoying.