How to Eliminate Fog While Driving on Rainy Days?
2 Answers
Methods to eliminate fog while driving on rainy days include: 1. Keep a damp towel in the car and use it to wipe away fog when it appears inside the vehicle; 2. If fog is caused by a significant temperature difference between the inside and outside of the car, open the window to equalize the temperatures; 3. When the windshield fogs up, switch the air circulation system to external circulation; 4. Turn on the automatic climate control system; 5. Spray an anti-fog agent on the windshield to form a protective film; 6. Turn on the air conditioner's cold air. The reasons for fogging in a car are: 1. Under certain humidity conditions, when the window temperature is below the dew point, condensation forms on the window surface; 2. A temperature difference on either side of the window causes the saturated vapor pressure on the cooler side to be lower than the surrounding environment's vapor pressure; 3. Moisture gathers on the glass surface, forming tiny droplets that create fog.
Driving in rainy weather with foggy windows is really annoying, and I often encounter this issue myself. The fog forms due to the temperature difference between the inside and outside of the car and high humidity, and it can be very dangerous if not handled promptly. I recommend pressing the defogging button immediately—the one with the fan icon on the front windshield—as it works super fast. At the same time, turn on the air conditioning and set it to cold air mode, directing it toward the windshield to quickly cool and remove the fog. Avoid using hot air, as it can make the windshield even more foggy. Also, switch the ventilation to recirculation mode to let fresh air in and reduce humidity buildup inside the car. If the fog comes on too suddenly, find a safe place to pull over and wipe the inside of the windshield with a dry, soft cloth—but never do this while driving. Preventive measures are simple: make sure the windows are clean and dry before driving, and slow down in rainy weather to allow more reaction time. These methods have greatly improved my driving safety and helped me avoid accidents for many years.
