Another expert tip is after your windows tinting is done. From the outside, you could do whatever you would like to do. The film is from the inside when cleaning the windows in the future from the inside, ammonia free products. So stay away from Windex. And I like to use something soft like a microfiber towel in the future. If you go to a car wash, there's nothing to worry about. They use a formula. And you are not the first person with tinted windows going to a car wash.