Unfortunately I don't think much can be done, especially in our moist climate at this time of the year.
There is water vapour in the air around us all the time, it gets inside these units and some condensation will occur. They are classed as sealed units but I would assume not vacuum sealed, I can't see how they could be without costing a huge amount of money.
In drier warmer weather it doesn't happen so often and clears much quicker when it does.
But once you have vapour inside it's going to be difficult for it to escape so you end up with a cycle of condensation.
Used to happen with my Mk2
Cupra too. I've seen the same effect in other brands of cars inc Audi and BMW.
The temperature of the main lights would often clear the condensation after a few mins.
However I would assume like most LED lamps they give off much less ambient heat so are probably not aiding to the clearing of condensation build up.
I understand it looks a bit naff, but unless your getting a lot of trapped water building up inside it ain't effecting the operation of the lamps.
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