I keep a microfiber mitt in my console and when the windshield starts to get cloudy, I pull out the mitt and clean the driver side with the dry mitt when stopped at red lights. Plenty of traffic lights on the way to work, darn it! I do the passenger side when I get to work. Cleans them right off as long as they aren't too dirty. Basically I find myself wiping them down about every 2 or 3 weeks.