This would not happen on the Earth's Moon or Mars (allegedly).
It is happenng to you because there is water in the atmosphere - even when you are fouling it up on recirc!
Blocked drains man - get on with it!
PS: If you find they are 'clogged' then the previous owner may have been a Dutch fella!
230 TE (W124) 1989 with 153,000 miles on the clock - hoping for at least another 100K