How to Deal with Foggy Windows?

[LaKing]

Spray it on the already foggy windshield and wipe it dry with a cloth, and the glass will be immediately clean. Use the air conditioner's cold air to cool. Using hot air to blow on the glass is more effective than using cold air.

[SanAdelyn]

Window fogging is one of my biggest headaches when driving, especially in winter and rainy days. My usual method is to directly turn on the air conditioning defogging function, which can absorb the moisture, and the fog dissipates in a few seconds. If the car doesn't have this feature, I use the heater to blow on the windshield, as the hot air raises the temperature and reduces condensation. Cracking the windows slightly for ventilation also helps, like opening a small gap to allow air exchange between inside and outside, but not too much to avoid rain or snow getting in. For prevention, I regularly spray anti-fogging agents on the glass to form a protective layer that blocks moisture condensation. When cleaning the glass, avoid using oily cleaners, as they leave marks and make fogging worse. After the car has been parked overnight, I wipe the interior glass with a cloth to remove residual moisture before driving. The root cause of this problem lies in temperature differences and humidity, so I keep a pack of desiccant in the corner of the dashboard to absorb excess moisture, which works quite well. After adopting these habits, the frequency of fogging has significantly decreased, making driving much more comfortable.

[AlexaLynn]

Fogging obstructs visibility and is extremely dangerous, so I prioritize safety when dealing with it. When fog appears, I immediately turn on the air conditioning defrost mode or set the warm air to the highest setting to quickly clear the view. If visibility remains poor, I pull over to handle it rather than risk driving. For preventive measures, I check if the humidity inside the car is too high; if parked in a damp environment, I run the air conditioning on dry mode for a few minutes before driving. I also use the external air circulation function to introduce dry air and reduce condensation. When cleaning the glass, I use professional anti-fog wiping tools to avoid leaving fingerprints that can cause fogging. Regular vehicle maintenance is crucial—I inspect door seals for aging or leaks that might let in moisture. Keeping the cabin tidy and minimizing wet items like umbrellas helps reduce the risk of fogging at its source, ensuring smooth and safe driving every time.

[CollinMarie]

I understand the principle of window fogging is the condensation of warm, humid air inside the car when it meets the cold glass. The key to defogging lies in balancing the temperature difference: turning on the cold air conditioning is the fastest way to dehumidify, as the cold air absorbs moisture and makes the fog disappear; or using the heater to raise the glass temperature prevents condensation. Switching between internal and external air circulation is also effective, as external circulation brings in dry, cold outside air to reduce humidity buildup. A simple daily method is to open the windows to allow air circulation and ventilation. Preventatively, I regularly clean the windows and use anti-fog sprays to form a protective film. These small tricks, based on physics, are easy to operate and quickly solve the problem, allowing me to easily handle various weather conditions.