What to Do When Car Windows Fog Up on the Outside in Rainy Weather?
2 Answers
Here are specific methods to prevent car windows from fogging up on rainy days: 1. Use the air conditioning system properly. Park the car, start the air conditioning, turn the temperature adjustment button to the warm air direction, and then press the defrost button to dry the windshield fog with the warm air produced by the air conditioning. When defrosting, you can switch the air conditioning to external circulation to let fresh air enter the cabin. Setting the compressor and fan speed to 25°C or higher can speed up defrosting. 2. Use specialized anti-fog products. Before each use, spray evenly on the windows and wipe clean to form a transparent protective film on the glass to prevent fogging. One application can prevent fogging for about ten to fifteen days. 3. Open windows to allow hot and cold air to circulate. If the fog is not heavy, you can open a gap in the windows on both sides to allow air inside the car to circulate. As the temperature inside the car gradually approaches the outside temperature, the fog will dissipate. 4. Use dishwashing liquid with a dry cloth. Mix dishwashing liquid with water in a ratio of 1:6, apply evenly on the inside of the car windows with a sponge, and wipe clean with a car towel after drying, leaving no water marks.
Fogging on the exterior car windows on rainy days is common, usually caused by temperature differences leading to condensation. When this happens, I usually turn on the wipers first to quickly clear the fog and restore visibility. If the wipers aren’t effective enough, I adjust the air conditioning mode, activate the front windshield defogging function, and blow some cold air to lower the exterior temperature—this method works well. Preventive measures are also important. Regularly cleaning the windows and treating the surface with an anti-fog spray can reduce the likelihood of fogging. Driving safety must come first—if fog obstructs your vision, pull over immediately to address it rather than pushing through. I recommend keeping a clean cloth in the car for quick wiping in emergencies—it’s cost-effective and convenient. Develop good habits by checking the wiper condition before every rainy trip and replacing them promptly if they’re worn out.
