Having just taken my (D2) lights completely apart to clean and polish (as per Iyole's excellent post), its worth mentioning that those units are not completely/permenantly sealed. When taking off the rear access covers to replace lamps or whatever you allow ambient air to enter the unit. The side/parking lights on the D2 Bi-xenon units are just loose/push fit and so there is ample space for ambient, moist air to get to the front of the unit and, when the covers are replaced, to remain there condensating on the front lens whenever the outside air gets cold.
Try venting the unit by removing the rear access covers and blowing through on a cold dry day. (we seem to be having a few of those at the mo')
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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