I recently cleaned my house windows with Turtle Wax® Chrome Polish after trying everything from sprayway, mineral spirit, paint thinner, purple cleaner, comet cleaner. I was amazed how clean it turned out. The windows had over spray paint and polyurethane when I refinished the wooden frame, and probably never been cleaned since the house was built in 1988.
I'm afraid to try on a windshield. Is there any film coating on the windshield?