Discoloured Xenon Headlights

[Bisonhead]

Afternoon all,

I have an A6 2.8 Quattro with Xenons. The nearside headlight has discoloured due to pitting/crazing (cant remember which). Its the same condition you see on a lot of older cars, Im not sure if it is a chemical breakdown or what but I would like to get it back to a nice clear state.

I have tried 180 and 2000 grain wet and dry, Brasso and even (carefully) wheel cleaner.

Any recommendations or tips?

Sorry if this is a common thread, I did search the first 12 pages and couldnt find anything similar (unless I am blind)

[Bisonhead]

Thanks, I will give that a go this weekend