What to Do When the Outside of the Windshield Fogs Up on Rainy Days?
3 Answers
The solutions for fogging on the outside of the windshield on rainy days are as follows: 1. Use the air conditioning system: Turn the temperature adjustment button to the warm air direction and press the defrost button to gradually remove the fog. 2. Use anti-fog products: Spray glass cleaner evenly on the window and wipe it clean. One application can prevent fogging for about ten days to half a month. 3. Cold and hot air convection: Open a gap in the windows on both sides to allow air convection and eliminate fog. Precautions for driving in the rain are as follows: 1. Slow down: Regardless of the road width or condition, drive slowly in the rain, always pay attention to the distance between vehicles in front and behind, and be prepared to take various emergency measures. 2. Maintain distance: Visibility is impaired when driving in the rain, so pay attention to maintaining distance between vehicles, always observe the distance between vehicles in front and behind, and increase the safe distance. Especially stay away from large vehicles, as they can block the view, and puddles that large vehicles can pass through may not be passable for small vehicles. Additionally, large vehicles can easily splash water, interfering with the driving of small vehicles.
Don't panic when your windshield fogs up on rainy days. I used to struggle with this issue when I first started driving. Turning on the AC is the fastest solution—set it to the windshield defrost setting and crank up the fan speed. Cold air clears fog quickly but may require repeated use in wet conditions. Switching to warm air provides longer-lasting results, though it takes more time; remember to keep the AC on for dehumidification. Crucially, avoid recirculation mode, as it traps humidity inside. Fogging occurs due to temperature differences and high humidity—I keep an anti-fog spray in my car for light rain, applying it before using the AC. Also, always activate your mirrors' heating function and utilize side/rear window defoggers when available.
Actually, I quite enjoy studying these physical phenomena. Windshield fogging occurs when the outside temperature is low and the humidity inside the car is high, causing the glass temperature to drop below the dew point. Water vapor then condenses into tiny droplets upon contact with the cold glass. The key solution is to either reduce the humidity inside the car or raise the glass temperature. The fastest method is to simultaneously turn on the air conditioning in cooling mode and direct the airflow to the windshield, as cold air dehumidifies quickly. For long-distance driving, using the heater mode is more comfortable, but you'll have to endure a more severe fogging process for the first few dozen seconds. Be careful not to open the windows for ventilation on rainy days, as this will introduce more moisture. It's also important to regularly clean the air conditioning filter, as a clogged filter can reduce dehumidification effectiveness.
