While you're in the car, you're breathing out moist air. Every time you get in the car with damp shoes or wet clothes you're leaving moisture in the car.
The moisture's being recirculated around the car and getting more moist all the time. In short, you're the problem.
Put the heater controls to fresh air and high fan speed with the aircon turned on. After a few hundred miles you should see an improvement.
Let us know how you get on.
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