I left a sunroof ajar last year and rain got in ....nightmare!! and the car is never right afterwards because the carpet underfelt will not dry, whenever i drove the car afterwards with the heater on the windows mist up sold it, to much hasssle,
but if you want to try? use an electric blow heater* in the car with the car in the garage with the windows down an inch.
Get a couple of cat litter trays and half fill with salt. Leave them on you seats over night. The salt draws the moisture out of the air. Just keep doing this for a few days..may take a week..but it works.
Used to do that with my Landies if I had been wading a bit too deep. Its amazing how much moisture it pulls out.
I have also heard of people using stockings filled with rice. Does the same but can be left in the car when driving..just dont =get pulled over by the fuzz!