What to Do When the Outside of the Front Windshield Fogs Up?
2 Answers
The solutions for fogging on the outside of the front windshield are as follows: 1. When the fog is not heavy, you can appropriately open both side windows to allow air convection, which eliminates the temperature difference on both sides of the windshield, making it difficult for fog to form naturally. 2. Turn on the air conditioning with cold air, which can quickly remove the fog in a short time. 3. Use a defogging agent. The principle of the defogging agent is simple—spraying a layer on the windshield forms an effective protective film that prevents water vapor from condensing. However, the effectiveness of this protective film is short-lived, requiring repeated applications to maintain the effect.
Fogging on the outside of the windshield is extremely common, especially when driving in rainy weather or early mornings. Once on my way to work, the fog was so thick I couldn’t see the road clearly, but a quick flick of the wipers solved the problem—the water droplets were wiped away instantly. For stubborn fogging, turn on the defrost mode of the AC, adjust the airflow direction toward the windshield, and crank up the fan speed. Blowing hot air from the AC for a while can raise the glass temperature and prevent recurring fogging. However, don’t rely solely on the AC—regularly cleaning the glass surface is crucial, as oil and dust can make fog cling more stubbornly. I use glass cleaner for a thorough wipe-down once a month, followed by an anti-fog spray to create a protective layer. Opening windows slightly in large temperature differences can also balance interior and exterior humidity, reducing fogging risks. Always stay calm when dealing with it, slow down, and prioritize safety.
