Removing Fog from Your Windshield in Hot Weather
Turn down the AC if it’s warm outside. If you’ve got foggy windows in the summer, turn down your air conditioner. This will warm up your car and get the inside air temperature to match the outside a bit better. You can also open your windows a bit to allow more outside air in (and it prevents your car from becoming too stifling).
Turn on your windshield wipers. If the fog is on the outside of your windshield (as it will be during the summer), you can remove it with your windshield wipers. Simply turn them on to their lowest setting and let them run until the fog is gone.
Open your windows. This is a quick way to get the temperature inside your car to match the temperature outside. Roll down your windows as far as you can so that the warm air outside gets into the cool interior of your car.
Removing Fog from Your Windshield in Cold Weather
Change your air source. Most cars come equipped with buttons that allow you to recirculate the air already in your car or to pull air in from outside. If your windshield is fogging, change the setting so the air gets pulled into the car from the outside. Look for the button that has a little car with an arrow pointing inside the car. Tap this so the light above it is on. Alternatively, tap the button with a car and circular arrow inside of it so the light goes off. This turns off the function that recirculates the air already inside of your car.
Lower the temperature in your car. Because fog is caused by differing air temperatures, getting the air temperature inside your car to match the air outside will reduce fog. Turn your car fans on the highest setting. And turn the air temperature down as cold as you can stand. This is the fastest method but also the coldest, so be prepared to shiver a bit!
Turn on the defrost vent with cool air. The defrost vent will direct air straight at your windshield, but the cool air will help your windshield temperature match the air temperature outside. This can help get rid of the fog on your windshield.
Preventing Fog on Your Windshield
Use silica cat litter. Fill a sock with silica cat litter. Tie off the end with a piece of string, and then place one or two full socks near the front of your dashboard. This should absorb the moisture inside your car over night, preventing any fog buildup.
Apply shaving cream to your windshield. Use the type of shaving cream that foams up when you squirt it out of the can or bottle. Spray a small amount of cream onto a soft cotton cloth and spread it over your entire windshield. Use a clean, dry rag to wipe it off. This should create a moisture barrier on your window, preventing fog build up.
Roll your windows down if you can. If your car is in a secure area, roll your windows down about a half inch or so. This allows some outside air to get in to the car, and can prevent the windshield from fogging. This method is best for the summer time, since you don’t want to risk any ice or snow getting into your car during the winter.
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