I have a Mitsubishi 45" RPTV that is about 5 years old and two kids. Although there are only a couple of slight scratches that are not visible unless up close, the grime seems impossible to get off! I have tried a few different cleaners without much success. Being made of some sort of plastic, with grooves, it is impossible to clean it well; so when there are bright scenes, you can see streaks and it's annoying! BTW, what would a new screen cost and is that something I could replace?