I had a few scratches on my screen that my OCD was kicking in. I read some bad reviews on Displex not working, so I decided to try out some automotive products. I got a clear plastic cleaner and polish, named "PlastX" by Meguiar's. it worked GREAT! all you need to do is apply a little bit of it on the surface of your screen and rub strongly with a cotton cloth. Make sure your screen is not directly LCD and has a plastic coat over it (like the 7100t), cause this stuff isn't made for LCDs.
go to Car Care Products: Car Waxes to Leather Cleaners, Meguiar's the Leader in Car and Surface Care since 1901
to look it up