How to Deal with Foggy Car Windows on Rainy Days?
2 Answers
The quickest way to defog car windows on rainy days is to turn on the front window defogging mode. Here is some information about preventing fog in advance: 1. Clean the inside of the windows before driving: Spray anti-fog agent and evenly apply it with a wet cloth or chamois. After the anti-fog agent solidifies, wipe it clean with a dry towel or tissue. The principle of the defogging agent is to form a protective film on the glass surface, causing small fog droplets to condense into larger water droplets, thus not obstructing the view. 2. Homemade defogging agent: Mix dish soap and water in a ratio of 1:6 in a bottle, and it can be used as a defogging agent. Except for the durability, which is not as good as commercial defogging agents, the rest are quite similar. Soapy water, hand soap, laundry detergent, etc., can all be used instead of dish soap, making it convenient and practical to use readily available materials.
I think the main reason for fogging inside the car on rainy days is the large temperature difference between the inside and outside combined with high humidity. As a driver with many years of experience, I’ve gotten used to taking preventive measures in advance: before heading out, I turn on the fan or the dehumidification mode of the air conditioning, such as adjusting the vents to blow toward the windshield, which helps reduce fog formation. If the rain isn’t heavy, cracking the windows for a short while to ventilate works fine; if it’s pouring, I focus on using the cold or warm air from the AC to defog. Keeping some anti-fog spray in the car is especially handy—one spray provides long-lasting results. Sometimes, when there are many people in the car and the humidity from breathing is high, I switch to recirculation mode to speed up dehumidification, then toggle back to fresh air mode to replenish clean air. It’s also important to keep the windows clean—dirty glass fogs up more easily, so wiping them once a week can prevent this. These simple and effective methods ensure safe and smooth driving, especially when visibility is crucial on slippery rainy roads.
