I don't smoke, and no one has ever smoked inside of my truck. However, I had a film on the inside of my windows, that I couldn't get rid of. I tried 5 or 6 different types of glass cleaner, I used different brands of paper towels, cotton cloths, and micro-fiber towels to wipe off the glass cleaner with... nothing would cut the film. Once the window would dry, it was there. Until I wiped the glass with a completely dry, clean microfiber towel. That was what I was missing. Nothing more than that. Happy to get to the final solution... but wish I would have gotten there a bit quicker.