What to Do When the Car Interior Fogs Up on Rainy Days?
2 Answers
If the car interior fogs up, the following methods should be used to clear it promptly. 1. Use the air conditioning system to adjust the temperature for defogging. 2. Turn on the cold air to blow on the glass, which quickly eliminates fogging—the defogging effect is very direct. 3. Use hot air to blow on the glass, but the effect is slower than cold air. When parked, turn on the hot air first, then wipe the glass with a cloth. 4. Open windows for air circulation. If the fogging is not severe and the outside temperature is not too low, you can lower the windows slightly on both sides to allow air circulation inside the car. 5. Use detergent-based antifogging solutions to prevent fogging in advance. Mix the detergent and water in a ratio of about 1:10, then apply it to the inside of the front and rear windshields using a cotton swab or a clean, soft cloth. After drying, wipe off any remaining watermarks on the glass. Using this method in combination with the air conditioning will yield better results.
I've been driving for over twenty years, and fogging up inside the car on rainy days is a common issue. It's mainly due to the temperature difference between the inside and outside of the car—the cold glass causes the warm, moist air inside to condense into tiny water droplets. My solution is to immediately turn on the air conditioning to defog, setting it to the windshield vent position, switching to external circulation to draw in dry air, and turning off internal circulation to prevent humidity buildup. The compressor works to quickly absorb moisture, with cold air defogging the fastest; when the rain isn't heavy, using warm air is more comfortable. When parked, I wipe the glass dry with a soft cloth or spray some anti-fogging agent as a preventive measure. It's also important to avoid leaving wet umbrellas or shoes inside the car to reduce moisture sources. Regularly checking the door seals prevents rainwater from seeping in and worsening the problem. Keeping a desiccant in the car can also help a lot. Visibility safety comes first—don't get distracted when driving in foggy conditions.
