I put big packs of silica gel behind the covers on all my lights front and rear.
Also cleaned the seals with a cotton bud and silicone spray.
I seem to recall this was not possible on the facelift rear lights but I fitted them in the dark in a rush so can't remember but they were more like sealed units IIRC. It seems to work but in very code weather I can get the odd bit but not like before.
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