What are the methods to deal with fog on the outside of car windows?

[VanJuliette]

Methods to deal with fog on the outside of car windows are: 1. Turn on the car's air conditioning system to cool and direct cold air onto the foggy glass; 2. Mix detergent with water and apply it to the outside of the car window with a cotton swab or a clean, soft cloth; 3. Open the sunroof or window to allow air convection inside the car; 4. Install a window heating and defogging function. The reasons for fog on the outside of car windows are: 1. The temperature of the car window is lower than the dew point temperature; 2. There is a significant temperature difference between the inside and outside of the car. The functions of car windows are: 1. To shield from wind and rain, and to reduce noise; 2. To lower wind resistance and guide airflow; 3. To protect the safety of passengers in the car.

[SimonFitz]

Fogging on the outside of car windows is something I often encounter while driving, especially on rainy or cold days. The fog occurs due to the temperature difference between the cold exterior and warm interior, causing moisture to condense on the glass. Handling it is quite simple: the first step is to turn on the windshield wipers for a few swipes—it clears up immediately and works really well. If the fog is stubborn, I usually activate the front windshield heating function (if the car is equipped with one), and the hot air will melt the fog after a while. Don’t forget to check if the glass surface is clean—dust buildup can worsen fogging, so it’s best to wipe it with a damp cloth or spray some glass cleaner as a preventive measure. If there’s no heating function, adjust the car’s air conditioning to warm air mode, avoiding strong airflow directly at the glass. For prevention, I make it a habit to use an anti-fog spray on the glass once a month, which works quite well. In short: deal with it quickly to ensure driving safety, and don’t let it linger to the point of blurred vision.

[DiCourtney]

As a new driver, I panicked when I first encountered this issue, but after some exploration, I found the operation isn't difficult. External fogging mostly occurs when driving on humid days. The first choice is to use the windshield wipers—a quick swipe can remove most of the fog effortlessly. If it doesn't clear completely, check if there's a heating switch on the control panel; turning it on for a few minutes will melt the fog away. If there are stains on the glass, they can accumulate fog faster, so I use a small cloth dipped in cleaner to wipe them off. For prevention, set the air conditioning to a moderate temperature to avoid excessive warmth inside the car, which can cause fogging. You can also try automotive anti-fog sprays applied to the glass surface to prevent moisture buildup. I must emphasize: heavy fogging is extremely dangerous, as it impairs visibility and increases the risk of accidents. If you can't handle it properly, don't hesitate—pull over and clean it thoroughly before continuing. Regular glass cleaning is a good habit; I started by washing my car weekly, which has saved me a lot of trouble.

[LaKiara]

The worst thing about driving with kids is foggy windows obstructing the view. External fog usually appears on cold, damp days. I immediately turn on the wipers to clear it; if that doesn't work, I check and activate the heating function. Cleaning is crucial—dirty glass attracts fog easily, so I simply wipe it clean with wet wipes. I adjust the air conditioning to warm air to avoid excessive temperature differences. Prevention is both convenient and safe: applying anti-fog spray or a bit of soapy water to the windows in advance creates a protective layer to reduce fogging. The key is maintaining clear visibility—safety first, no risks. Developing these habits avoids trouble, and I regularly check these settings.

[Gray]

I always prefer solving problems myself. To deal with exterior fogging, my first choice is to turn on the wipers to sweep it away. If that doesn't work, I turn on the glass heating function (available in most cars) to blow hot air and disperse the fog. I also check the cleanliness of the glass—dirt buildup tends to cause fogging, so I often use a glass cleaning cloth or a damp cloth to wipe it down. For prevention, simple and effective methods include spraying an anti-fog spray on the surface to form a protective layer, or making a DIY anti-fog coating by diluting dish soap with water and applying it to the outside of the glass before letting it dry. In daily maintenance, adjusting the car's air conditioning to avoid overly strong warm air helps reduce moisture condensation. This method is cost-effective and practical, and I perform a monthly check. From a safety perspective, addressing fogging early helps prevent accidents.