How to Remove Fog from Car Windows?
2 Answers
Methods for defogging car windows are as follows: 1. Cold Air: The most common method is to turn on the AC cooling switch + maximum airflow to the front windshield + external circulation (if the humidity outside is higher than inside, internal circulation is recommended). This method works the fastest. 2. Rear Window Heating Wire + Rear Wiper: Almost all cars now have a "rear window heating" function. Its advantage is that it melts snow and removes fog. During rain, it can be turned on along with the rear wiper for better results. 3. Wiping the Inside of the Window with Windshield Washer Fluid: This is a convenient method when outdoors. Use a towel dampened with windshield washer fluid to wipe the inside of the front windshield, the four side windows, and the left and right rearview mirrors. It's advisable to keep a bottle of windshield washer fluid in the car trunk for emergencies. However, the effect doesn't last long, so it should be used in conjunction with the air conditioning for sustained defogging. 4. In cases of light fog, you can slightly open both windows to allow air convection.
Don't panic if you find all windows fogged up when getting in the car. I usually turn on the cold air directly blowing at the windows, and using external circulation works faster. In winter, use warm air instead, though the fog will worsen initially—keep blowing for half a minute to clear it. When there are many passengers, remember to press the defog button; the AC will automatically increase airflow. Regular maintenance checks on the cabin air filter are crucial—if it's clogged, weak airflow from the vents will slow defogging. Another tip: turn off the heater before parking and open the windows to ventilate, reducing temperature differences that cause fogging next time. On rainy days, keep a dry towel handy for emergency wiping if sudden fogging occurs, but never wipe while driving.
