I had some scratches/smears that I could not remove on my 4:3 screen. I had pretty good sucess by placing a PDA screen protection film on the screen. It's anti-glare and hides most of the imperfections I have. It's also very cheap. Check it out, under $20 US.
http://www.fellowes.com/Fellowes/sit...spx?Id=9000206
