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You\u2019re driving down the highway and your car\u2019s windshield fogs up, so you blast the defroster. The fog goes away but then returns again a few minutes later. You repeat this process until you arrive at your destination.<\/p>\n
The same thing happens to the car\u2019s driver- and passenger-side windows. The windows fog up so you can\u2019t see your rearview mirrors, so you roll the windows down and then back up to squeegee the moisture off. But then the fog simply comes back again.<\/p>\n
And on the fight against vehicular window fog, and its visibility-robbing haze, goes.<\/p>\n
Fortunately, there\u2019s a way to escape this seemingly endless cycle of fog recurrence and achieve driving nirvana. We share your exit strategy below.<\/p>\n
To understand how to prevent your vehicle’s windshield (and windows) from fogging up, it helps to understand why they fog up in the first place.<\/p>\n
Fog on the inside or outside of your car windshield is condensation that forms due to a difference in temperature and humidity near the glass. The nature of this differential varies according to the season of the year.<\/p>\n
During the winter, window fog typically occurs inside<\/em> of your car. That\u2019s because the temperature and humidity on the inside of your vehicle are higher than they are outside of it. All that hot vapor from the passengers\u2019 breath condenses on the inside of the windows\/windshield once it hits the cool glass.<\/p>\n When you experience foggy car windows in the summer, the condensation usually occurs on the outside<\/em> of the car windows. That\u2019s because the temperature and humidity on the outside of your car are higher than on the inside where you\u2019ve got the cold, dry A\/C running. Once the hot, moist summer air hits your car\u2019s windows, condensation forms on the outside of the glass.<\/p>\n Knowing where the condensation is forming \u2014 inside or outside \u2014 will guide how you implement your preventive anti-fog measures.<\/p>\n Clean your windows.<\/strong> The first step in preventing automotive fog is to give your vehicle’s windows and windshield a nice wipe down. Dirt and oils on the glass will attract and maintain condensation. Clean your car’s windows\/windshield on both sides with some window cleaner and a newspaper or paper towel.<\/p>\n Apply an anti-fog spray.<\/strong> Anti-fog spray contains chemicals that prevent water from condensing on your glass.<\/p>\n Remember, if it\u2019s winter, the fog will be forming on the inside of your windows\/windshield, so make sure to get a spray that’s designed for interior glass<\/a>.<\/p>\nHow to Keep Your Windshield From Fogging Up<\/h2>\n