I just let it evaporate naturally. As mentioned prior just follow your normal cleaning pattern (ie weekly wash). A quik fix wipedown for appearance purposes is not worth the damaged causes by wiping a non-cleaned surface in haste with any type towel. Car covers also have their drawbacks for vehicles parked outdoors also creating more work in terms of repairing the surface marring they (covers) produce.
I have a white daily driver SUV that sits outside 24/7 and I leave for the hospital at about 5am. Every morning it is coated with dew. By 9am the moisture is gone and a pristine finished is revealed for all to admirer. A good protectant will achieve this goal. JMHO