Does anyone else have this problem? On rainy days, the windscreen mists up. That's fine, happens in a lot of cars and I just have to put the aircon on to help clear it. However, in my car this also happens when it is dry. And to make it worse, as soon as I turn the air-con off the mist returns quite quickly. There are no funny smells from the air system, and I don't get any misting up on the side windows or rear window. Does anyone have any idea what this could be, and more importantly how I can stop it!