How to Prevent Car Windows from Fogging Up?
2 Answers
Methods to prevent car windows from fogging up: 1. Spray anti-fog agent - apply a small amount of defogging agent on the inner surface of car windows, then wipe clean to remove stains and marks; 2. Air conditioning cooling method - use the AC's dehumidification function to reduce air humidity and eliminate fog; 3. Air conditioning heating method - eliminate condensation by reducing temperature differences. In summer, car window fogging occurs on the exterior surface because the interior temperature is lower than outside. When warm outside air contacts the cold glass, water vapor in the air condenses into droplets on the glass surface.
After years of driving, I've found that the secret to preventing car window fogging lies in controlling cabin humidity and ventilation habits. Before getting in the car, I open the windows for a few seconds to allow air circulation, then start the engine and set the fan to medium speed with the air conditioning's dehumidification function. In winter, I prefer using warm air directed at the windshield, switching to external air circulation first after starting to reduce moisture buildup. During summer, I use the cold air dehumidification function set to low temperature. When parking, I leave a small gap for ventilation to prevent moisture from being trapped inside. Additionally, I never bring wet items like umbrellas into the car, keeping the interior dry. Maintaining these simple habits has virtually eliminated fogging, making driving much safer. Extra tip: Cleaning windows with a microfiber cloth to remove grease makes it harder for fog to form.
