How to Deal with Foggy Windows on Rainy Summer Days?
2 Answers
If the fog is not heavy and the outside temperature is not very cold, you can slightly open both side windows to allow the interior temperature to gradually match the outside temperature, which will help dissipate the fog. Use specialized anti-fog products; one application can prevent fogging for ten to fifteen days. Turn on the air conditioning in cooling mode, and the cold air will blow towards the windshield to clear the fog. When defogging, you can switch the air conditioning to external circulation to allow outside air into the cabin.
I've encountered the issue of foggy car windows on rainy days way too many times. Driving with blurred vision is downright terrifying. The main reason is the high humidity during the summer rainy season, where the temperature difference between inside and outside the car causes moisture to condense on the windows, easily obstructing the view. My habit is to turn on the defogging function of the AC as soon as I get in the car, setting the temperature a bit lower. The cool air blown out can quickly reduce the surface temperature of the windows, evaporating those water droplets. Also, remember to switch to the external circulation mode or crack open a window slightly to let the humid air out. Don't rush to wipe it with your hand, as that can smear the glass and compromise safety. Additionally, I recommend regularly checking the AC system—for instance, replace the filter promptly if it's dirty, otherwise, the dehumidification effect will be poor. By handling it this way consistently, driving won't be such a headache anymore.
