Did you just say the defrost moment where it gets foggier? Do people not know how common temperature works if it's getting foggier? It's because the temperature outside. Is hotter than the inside temperature, you're probably using cold air. If you use heat, then you won't have a problem. Also, you have to have your air on, it can't be recirculating air and it can't just be the Air. Ac turned off, it has to be crisp, clean air, and you can switch the temperature. That's why it's not clearing your windshield common sense.