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Happy New Year everyone! It was cold and foggy here in Sacramento so I decided to do something about the yellowish headlights on my 03 996 C4S. I got the car about 3 weeks ago and it looks great but the headlights were somewhat yellowish. Looking at them closely, I noticed that there were very fine cracks and oxidation on the surface and decided to try to polish them. I found a "headlight lens restoration system" by 3M for $20 at Autozone. I removed the headlights and cleaned them well. Then I used a 500 grit disc (dry) on a drill to remove heavier scratches: The headlight looked completely ruined after sanding them with the 500 grit sand paper disc :o Then I used the 800 grit disc (dry) also on a drill to remove the scratches left by the previous disc: The headlight was not looking any better yet. The next step was to use a 3000 grit Trizact disc but I decided to wetsand using 2000 grit paper before: Then I used the 3000 grit disc (wet) on a drill. The disc is part of a thin foam pad so it stayed wet and worked nicely: The it was time to use the polishing compound on a foam pad. Just a little went a long way: This is the passenger's side headlight after polishing: And the driver's side headlight after polishing: I didn't take any photos before polishing them but I compared them after polishing only one and the difference was amazing. It removed all the yellowish tint from them. I'm going to buy some UV block for plastic tomorrow and see how long they stay clear and shinny. It took me about an hour and a half to do both headlights. So, if your headlights are not as clear as you would like, don't be afraid to sand them ;) Oscar