its a bit of a vicious circle with air con - once you've had it on it dries the air in the car, when you turn it off you start filling the car with damp air & it condenses on the windows. this can even happen the next day if you've had the air con on the previous day. the best way to clear it is to open the windows (preferably using the buttons, not a brick
)
if you're getting really bad misting in the wet it could be there's a leak somewhere in the seals either around the doors or windscreen - have you checked the door seals for damage or dirt? even trapped dirt can reduce the effectiveness of the seal.
alternatively it could be that the fan isn't blowing as hard as it should be or there could be a blockage in the vents or tubing somewhere.
