The previous owner sprayed some kind of dark tint on all the windows of my car. I've been able to get the side windows clean but it's taken a lot of time and effort. It's very hard to scrape and lacquer thinner barely touches it. Trying to get down at the bottom of the windshield/dash pad is particularly hard. I'm even considering removing the front and rear glass so I can clean it easier. Has anyone ever removed this stuff? What worked for you?