There is no need to bother, open the car door and dry in the sun, take the foot pad out and dry, but the car must be dry,
It is strongly recommended to do a comprehensive inspection and cleaning in 4S shop, or if they rust or mildew, it would be bad.
About humidity, then I suggest you lift a piece to wipe around the water leakage places, or your air conditioning pipes have water leakage for a long time, if the seal equipment is good, then there is nothing. If there is paint, it's ok
