My headlights have a few brown spots, assumed to be burn spots from the halogen bulbs. Not exactly sure what bulbs are in there now, if they are at the suggested wattage or above (may have previously had headlight bulbs that ran too hot from previous owner).
I was going to remove the headlight bulbs and then try and get something (not exactly sure what) in there to see if I could clean the brown spots off.
Not sure if this is possible or not, or is it may even be possible to replace the lens itself (which I assume would then require opening the headlight assembly which then leads towards replacing the current halogens with bi-xenon projectors or more likely paying someone more equipped to do that kind of work).
Here is a pic of the lens now:
