Sorry if this is old hat, but I couldn’t find it in the How-to list, so I thought I’d share.
I bought a 1998 NB about 10 days ago and have spent what seems like every spare hour since restoring the very tired red paintwork. It looks great now, but the hazy yellow headlight lenses were letting the car down. After much research into ‘miracle products’, I came across this video on YouTube.
I followed the instructions to the letter and I have to say the results are AMAZING! My lights are perfectly ‘white’ and clear now - no more yellow, no more fog/haze - just like the guy says. The only comments I would make are:
- make sure you have a power buffer (as in the video), because in my experience hand polishing just never quite matches the results achieved with a machine (when used carefully!);
- I ordered some of the Meguiar's PlastX clear plastic polish specially, but TBH it's a bit superfluous. It might protect the freshly cleaned lenses I suppose, but visually it adds little to the overall result after the sanding and buffing.
Here is a picture halfway through the process, after the sanding but before using the power buffer and rubbing compound (I have to admit I was a little nervous at this stage 
)
The masking tape I had stuck on as a precaution to avoid damaging the paintwork was falling off at this stage due to the water.
And here is the result after applying rubbing compound and buffing (I actually repeated this stage 4 times in total):
Pretty amazing really for a few quids worth of sandpaper and rubbing compound.
well done 