I recently bought an '05 330 Ci convertible with OEM nav. The 16:9 screen was so badly scratched and discolored it made me sick! Someone must have used some nasty cleaners, solvents and abrasives. Otherwise the unit worked perfectly. I was about to give up and fork over the big moolah for a new screen when I decided to try to remove the messed up anti-glare coating (the blue/purple stuff). I figured on destroying the whole thing but so what since it was a last ditch try and soon I'd be broke from buying the new one. Wow, did this ever work! Absolutely as good as new or maybe better. I started with Collinite's No. 850 Metal Wax, a fingertip and a very soft cotton rag. Just a drop or two on the rag every few minutes. Rubbed lightly for about 15 or 20 minutes. Used Q-tips in the corners. Then some Novus No. 3 heavy scratch remover, and finally some Novus No. 2 fine scratch remover. The whole deal took about an hour or less. Bingo!! The screen is absolutely spotless. And I really can't tell if there is any difference in the glare, but it does seem a bit brighter which is welcome news. Hope this helps somebody else!