How to Deal with Fogging on the Inside of the Windshield on Rainy Days?
4 Answers
Open both the front and rear windows slightly, preferably in a diagonal pattern. Without the temperature difference, the fog will naturally disappear. Use warm air to evaporate it, and the fog will disappear. Many cars also have a one-touch heating defogging button—just press it to remove the fog. You can turn on the air conditioning to cool and defog. Since the fog is caused by temperature differences, equalizing the temperature inside and outside the car will prevent fog from forming. There are many defogging sprays available online. Simply spray them on the windshield, and fog will no longer form.
As an experienced driver, I've seen fogging on the front windshield on rainy days many times. In the past when there was no air conditioning, we had to quickly wipe the inside of the glass with a towel after getting in the car. Otherwise, the fog would blur vision, and opening windows wouldn't help fast enough. Nowadays, cars come with air conditioning systems - just turn on the defog function when fog appears, select the external circulation mode, and the AC will blow away the fog. The key is prevention: for example, open windows slightly for a few minutes before driving in rain to reduce humidity buildup. After starting the car, immediately turn on the AC directed at the windshield with higher fan speed for better effect. Safety first - never wipe while driving. Remember, fogging happens simply due to temperature difference between inside/outside the car plus moisture from breathing condensing on cold glass. Handle it promptly and stay calm.
I really enjoy the high-tech features in my car, especially on rainy and foggy days. I don't panic at all—just press the AUTO button on the center console to activate the automatic air conditioning. Set the desired cabin temperature, say 24°C, and the system automatically adjusts fan speed and temperature based on humidity changes to defog the windows, much faster than manual operation. For even quicker results, switch to recirculation mode to let fresh, dry air in and reduce cabin humidity. If your car has a multifunction screen, you can also access the AC settings to fix the vent direction to the windshield. This method is both efficient and safe—clear visibility in rain and fog is crucial for focused driving. Extra car maintenance is key to preventing fogging: regularly clean the inside of windows to prevent dirt from absorbing moisture and causing early fogging.
Driving with foggy windows on rainy days really bothers me, but now I've learned a simple trick to handle it easily: After getting in the car, immediately turn on the ventilation system, adjust the vents to blow towards the windshield, and increase the fan speed with either cool or warm air. The fog will clear up in a few minutes. Remember to activate the external circulation function at the same time to improve airflow and reduce moisture buildup. For minor fogging, I sometimes use a dry cloth to wipe the inside of the glass as a temporary solution, but the air conditioning is more reliable for long-lasting results. I've also noticed that on rainy days, it's better not to close the car door immediately after getting in; letting the hot air out for about half a minute helps prevent fogging troubles.
