How to Deal with Foggy Side Windows?

[DelMatthew]

Turn on the maximum cold air (press A/C), direct the airflow toward the windshield, and the fog will be quickly blown away, restoring clear visibility. Direct the airflow toward the windshield. Once the windshield's temperature rises and the temperature difference is eliminated, the fog will clear. Simply spray on a towel and wipe the glass. The effect lasts for about a week. Use the wiper to clean the outside of the window. For the soapy water on the inside, gently wipe it with a tissue until it's semi-dry.

[LeAlan]

I've seen my fair share of foggy windows, especially during winter commutes when the car interior gets misty as soon as I get in. The reason is simple: large temperature differences combined with high humidity inside the car, possibly due to rainy weather or breath moisture. My go-to solution is turning on the AC first, setting it to cold air mode because cool air quickly dehumidifies and clears fog. Simultaneously, direct the AC airflow toward the windshield and press the defogger button if your car has one. For heavy fog, slightly opening a window helps balance indoor and outdoor air. Remember not to wipe the glass with your hand—it only smears the surface and distracts from driving, which is dangerous. For prevention, I've developed habits like ventilating the car for a few minutes before getting in or keeping a small dehumidifier bag inside. If fogging occurs frequently, it's time to check the AC system—blocked air ducts or dirty filters that haven't been replaced can worsen the problem. Above all, safety comes first: if visibility is severely compromised, pull over to handle the situation before continuing.

[OEvelyn]

I enjoy studying cars in my spare time. Window fogging mainly occurs due to condensation of interior humidity on the glass, with temperature difference being the key factor. There are a few simple solutions: Turn on the heater or air conditioning immediately after starting the engine, set the temperature to a moderate level, and direct the airflow towards the windows for quick evaporation of fog. Alternatively, use the air conditioner's dehumidification function by turning off recirculation to allow fresh air in and reduce humidity. In emergencies, slightly opening a window for a minute or two can quickly resolve the issue. For prevention, I recommend regularly cleaning the windows to avoid oil film buildup obstructing visibility, or purchasing anti-fog sprays—a small investment that goes a long way. Persistent fogging might indicate an issue with the air conditioning system, such as insufficient refrigerant or a fan malfunction, in which case a visit to the repair shop is advisable. Developing a habit of checking air conditioning settings before driving can prevent many hassles.

[DiEmmett]

When I first got my driver's license, I often panicked when the windows fogged up. Now I've learned to turn on the heater or air conditioner as soon as I get in the car, setting the temperature higher to warm the glass and clear the fog. Simple actions: press the defogger button or manually adjust the air vents to direct airflow toward the windshield. Cracking the window slightly also helps, as ventilation balances the temperature difference. Remember not to wipe the glass aggressively with a cloth—it can smear the condensation and make driving unsafe. This happens more often on rainy days or during long drives when humidity is high from breathing. I usually keep a spare towel for gentle wiping in emergencies. For prevention, I recommend leaving a small gap for ventilation when parked or washing the car regularly to keep the windows clean.