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If they are completely sealed you'll obviously have to find a dry environment. Keep a humidistat in an air conditioned house and see what you can do, or wait for dry weather outside but that might take until mid winter depending on where you are.
I haven't had this car long enough to know its details, but my last cars had open headlights. There was a small rubber tube in them so they vented to the outside. Keeping them the same inside and out that way always kept them fog free. Is that not the case with the 1-series?
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