That happened to me one freezing day in December. I go to get in my car in the parking lot, sit down, and can't see anything out of the windshield. Okay... I go outside to scrape it off, and realize there's nothing on my windshield outside! Go back in, and to my amazement, I find that my windshield is covered in ice on the inside. I had to use my fingernails to scrape a large enough hole for me to see safely enough to drive... Winter totally blows, I can't wait to be able to wash my beautiful car again and take pride in its holy majesty.