I have a 89 Blazer. The back window rolls down using a key or the switch on the dash. I'm trying to tint the window but it came out terrible because there is some type of dotted coating on the window. I'm not sure if it's factory tint or if the window was designed that way. I tried scraping it with a razor but it's not coming off. Hope all this makes sense. I just want to tint the back window with 5% tint to really block out the sunlight.