Ensure that the air recerc button is working. When I bought my year old MK 1 Superb it had a recerc flap servo fault (probably there from new) that caused all sorts of misting up problems - fortunately sorted under warranty. Big dash out job!
If that is working to spec - As previously suggested switch AC off a few minutes before the end of a journey to purge moisture out of the air con/climate system. When you finally park up for the evening push the recerc button just before turning off. This seals the interior from the outside world / dew /frost etc...
Don't forget to push recerc again to allow fresh air back in when next driven.
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