My daughter has a 2010 civic coupe. The Windows were all tinted but you really couldn't see out the back window, especially at night. I removed the rear window tint AND the glue but there is still some sort of foggy film on it. Is that part if the defrost strips or something? Can I remove it? It has borders so I know it's not left over glue and I have seen it on other civics. Can I remove it to get a clear rear window or is it essential?