+1Get a moisture absorber thing and get all the water out of your car, obviously it has got in at somepoint.
My Civic Type-R is terrible for condensation on the inside, on a couple of occasions I've had droplets of water on the inside of the windscreen.
Stuck one of those silica gel packs in the car on the dash last night and got in to a completely clear front & rear windscreen. Magical little things!