Most people are terribly lazy when clearing their vehicles of snow. These same stupid people don't understand that the defroster that they have cranked to high to clear their windsheild is sucking in all the snow flying off their hood, melting it and putting that moisture onto the inside of the windsheild, further fogging up the car. A couple of swipes and clearing the air intake usually prevents this but I'll bet you the vast majority of the automotive masses don't even know where the air intake on their car is located or how to prevent interior moisture buildup in winter. Stop being lazy & stupid people, you'll live longer and oh ya those frosted up things on the side of your car are called mirrors and you need them too!