What Causes Frequent Windshield Fogging?

[DiHarrison]

Windshield fogging mainly occurs in winter or cold rainy seasons due to the significant temperature difference between the inside and outside of the vehicle. The window temperature becomes very low, and when people enter the car, the water vapor they exhale, along with external moisture, condenses instantly upon contact with the cold glass, forming a layer of fog. Turn on the air conditioning for cooling: The most effective way to deal with fogged glass is to turn on the air conditioning (A/C) for cooling, activate the external circulation, and direct the airflow toward the windshield at maximum speed. This way, the dry cold air blows directly onto the windshield, creating a "gas film" that prevents water vapor from condensing on the glass. Use anti-fog glass coating: Anti-fog glass coating is a concentrated care solution. By spraying the anti-fog agent onto the inner surface of the car glass and wiping it clean, it not only removes dirt from the glass but also forms a protective film that prevents moisture from condensing into a fog layer. This method can effectively prevent fogging for up to 14 days.