For some great tips on how to clear those foggy windows, check out this blog post for some helpful tips on clearing things up in a hurry:
- For a quick fix: Lower the temperature inside your car rapidly by turning on the defrost vent with cool air or cracking a window; don’t turn on the heat. This will make the inside of your car cooler and help reduce the fog. Also, turn on your car’s rear-window defogger to help clear up the back window. Though this is a fast and effective method, it could leave you shivering.
- For a more comfortable solution: Lifehacker.com advises those who want to be snug and warm while driving to turn on the defroster and blow warm air across the windshield to evaporate the accumulating moisture. If your vehicle’s ventilation system has a recirculate feature, turn it off. When this feature is on, your car’s heat or AC reuses the air inside the car, instead of continually pulling in air from outside. If you’re trying to defog the windows in cold weather, you want your car to continually take in the dry air. (Not sure if your car has recirculation? Look for a button on the dashboard that has an arrow going in a circle or a semi-circle. Sometimes, it will feature an icon of a car with this type of arrow inside it.)
- Plan ahead: Keep your car glass as clean as possible — on the inside and the outside. That way, when your glass fogs up, you know the problem isn’t just a dirty windshield. You may also want to think about using a product that you can spray or wipe onto the inside of your windows in order to help prevent fog from forming.
(The Allstate Blog, How to Deal With Foggy Windows, By Melissa)