One thing to know before you use rainX....once you use it, you must keep using it, or it will eventually turn into a orange peel like coating on your glass. A friend had a car that the original owner had used it. He got the film, and there was no way to get it off. We tried everything you would ever try on a windshield, and some stuff you would never try. Talked to an auto glass guy, he knew it was rainX right away. A fresh application smoothed everything out, and he was fine.