If you've ever driven a car that's parked outside in winter, you'll know it's frigid as hell inside your car and the windshield can be totally opaque from all the foggy arse frost. Not cool. How do you get rid of it? Hit the defrost button right? That's not all. The always inquisitive Mark Rober tested out every combination on how to defrost your windshield and came up with a way that is twice as fast as other methods. That means you'll get a clear windshield in half the time.