i got that with my ford cmax and it was the seals letting in moisture/also moist air, and some water too at times. also as said above, the air con can help. I also am inclined to cool down the interior of car in last few miles before getting home in winter especially as the warm air in car turns to water.
Current Car: Hyundai Kona Premium EV...2 way 40kg hoist
Last Car: Toyota C-HR Excel Hybrid...4 way 80kg hoist