What to Do When Car Windows Fog Up on Rainy Summer Days?

[BraxtonAnn]

Wiping off the fog with a towel is the easiest and quickest method to remove fog, but you need to park the car first, as wiping the fog while driving can distract your attention. Using window ventilation to remove fog: Since window fogging is caused by the temperature difference between the inside and outside of the car, you can open a small gap in the window. Utilize the air conditioning's defogging function. Currently, most cars are equipped with a defogging feature; simply turn on the window defogging function. You can apply anti-fog spray in advance for prevention, especially in cities with significant day-night temperature differences or frequent rain and snow.

[CalebDella]

Having driven for so many years, fogging up in summer rain is all too common. The most effective method is to immediately turn on the AC cold air and direct it at the windshield, remembering to activate the AC dehumidification mode. If there are many people in the car exhaling humid air, switch from recirculation to fresh air mode, and the fog will clear up quickly. If the rain isn't heavy, crack the windows a bit for airflow, but be careful not to let rainwater drift in. Keeping a dry towel handy to wipe off external condensation is the most convenient—I once helped a colleague deal with sudden fogging on the highway this way.

[Mercedes]

Last time I encountered this situation while taking the kids out, here's how I handled it: First, I turned on the air conditioning to blow on the windshield at maximum fan speed for the quickest effect. I set the wipers to medium speed to constantly clear external condensation. If the humidity inside got too high, I cracked the windows slightly. After getting home, I immediately applied anti-fog treatment to the windshield, which remained effective for six months. Keeping an absorbent chamois cloth in the door pocket helps - when fogging occurs, wiping the exterior with it cleans better than wipers, even conveniently removing water droplets from side mirrors.

[VanKeira]

As a tech enthusiast, I enjoy studying the principles. Fogging is caused by the temperature difference between the inside and outside of the car combined with humid air. Immediately turn on the front defogger function, and the air conditioning will automatically activate dehumidification. For manual operation, pay attention to three points: the AC switch must be on, adjust the air vents to the windshield mode, and turn the temperature knob to the blue zone. For rear window fogging, press the heating button, and the small grid lines will heat up to remove the fog. Replace aging wiper blades promptly, otherwise they won't clean properly and will leave water marks.

[AmeliaMarie]

Actually, the simplest way to defog in summer is to turn on the AC. But what if some older cars have weak air conditioning? My experience is to first turn off the AC and switch to the maximum heat setting to blow air onto the windshield. Hot air actually removes moisture more effectively. Once the engine warms up, crack the windows slightly to let the moisture escape. Avoid placing wet umbrellas or spilled drink bottles in the car, as these add moisture. Keep a bottle of defogging spray (costs around ten yuan) and apply it monthly. After application, the windshield will be as smooth as waxed, and even heavy rain won’t leave water droplets.

[LaAllison]

When encountering heavy rain and fog on a long-distance drive, safety comes first! Immediately turn on the hazard lights, move to the far-right lane, and slow down—avoid sudden braking. At the same time, activate the defogger button and increase the fan speed to quickly disperse the moisture. The biggest enemy of window defogging is a clogged cabin air filter, which should be replaced every 20,000 kilometers. I always keep a foldable squeegee in the glove box—it works much better than a towel. In summer, open the windows for half a minute before turning on the AC to prevent sudden fogging on the glass, which could affect safe driving.