Repair a stylus?

I just received a Pencentra 200, to use for a GPS display in my truck. It is the first screen that the polish seemed to just "bead up" on the surface. It removed a lot of gunk. I didn't have any denatured alcohol in the house, to preclean the display, Fujitsu really stresses the use of alcohol on their tablet units, the older models anyway.

The polish made the screen on my $25.00 mp 790 look like new.

Another really good plastic polishing system is the "NOVUS" products. There are 3 levels of strength and a maintenance polish. I usually find it at larger motorcycle dealers or some glass dealers.