Buzz
Fog forms on the windshield when air at different temperatures comes into contact. This means that in warmer seasons, fog appears as warm outside air meets the cold windshield. In colder weather, fog forms when the warm air inside the car meets the cold glass surface. Understanding how fog forms allows you to eliminate this factor regardless of the weather. You can also prevent fog buildup on the windshield to save time.
Steps
Eliminating fog on the windshield during the hot season
Reduce air conditioning power when the outside temperature is warm. If the windshield fogs up during hot weather, reduce the air conditioning power. This will warm the air inside the car, balancing the temperature with the outside. You can also slightly crack the windows to allow fresh outside air to circulate inside for better ventilation.
Turn on the windshield wiper and washer system. If fog builds up on the outside of the windshield (especially during the summer), you can clean it using the windshield wiper and washer system. Simply activate this feature at the lowest setting until the glass is clear.
Open the windows. This method will quickly balance the temperature inside the car with the outside. Open all windows to allow warm outside air to circulate inside the vehicle.
Eliminating fog on the windshield during cold weather
Change the air source. Most cars are equipped with buttons for internal air circulation or for bringing in fresh air from outside. If the windshield is fogging up, switch to the external air intake mode. Look for the button with a small car icon and an arrow pointing from outside to inside, then press it. The light above this button will turn on.
- Alternatively, you can press the button with a car icon and a rotating arrow inside to turn off the operation indicator. This will deactivate the internal air circulation function.
Lower the car's interior temperature. Fog forms due to the difference in air temperatures, so you should reduce the interior temperature to match the outside to minimize condensation on the glass. Set the fan to the highest setting and lower the car’s temperature to the lowest level you can tolerate.
- This is the quickest method but also the coldest, so make sure you're comfortable with it.
Activate the cold air defrost vents. The defrost vents will direct cold air onto the windshield, helping to balance the temperature on the glass with the outside. This will prevent fog from forming on the windshield.
Preventing moisture buildup on the windshield
Use cat litter. Place some cat litter inside a sock, tie the sock with a rubber band, and place one or two of these socks near the dashboard. The cat litter will absorb moisture inside the car overnight, preventing condensation from forming.
Apply shaving cream to the windshield. Use a shaving cream that dispenses foam from a can or bottle. Spray a small amount onto a soft cotton cloth and rub it over the entire windshield. Use a clean, dry cloth to wipe it off. The shaving cream creates a moisture-resistant layer on the glass that helps prevent water buildup.
Crack the windows if possible. If the car is in a safe area, open the windows about 1-1.5 cm. This will allow outside air to flow into the car, preventing fog from forming on the windshield.
- This method works best in warm weather, as attempting it in cold climates may result in snow or ice entering the vehicle.
Warning
- Never step outside while the car is cleaning the windshield. If you need to wipe the windshield and the wiper and washer system is not working, stop and park the car safely in a parking space.
