Do not, under any circumstances use any kind of plastic polish on your LCD! I scratched my old ibook's LCD and I bought a tube of polish for cell phone screens, All it did was remove the polarizing layer from about a 3 inch area of the screen and the scratch was still there too. It made it ten times worse. I suggest you live with it, or there a companies that will re-polarize the screen for around $100, but you could most likely find an entire LCD for a not much more than that.
PB G4 15" 1.2ghz - Pismo G3 400 mhz - iBook G3 500 "Jukebox"
"SawSmurf" G4 500 - Quicksilver G4 Dual 1ghz modding...