Press the defogger button, it will turn on the AC and the Fresh air then send dry/cool air to your windshield. This will clear the front windshield really fast. Turning off the defogger will put you back to your previous settings. SO basically when I'm driving I keep my hand on the shifter and my finger just in-front of the defogger button. ALSO don't make the cabin too hot because it will fog up your windshield sooner.