How to Deal with Fog Inside the Windshield?

[Carlos]

Methods to handle fog inside the windshield: 1. Cold air defogging: Turn on the air conditioning and switch the air outlet mode to the windshield setting; 2. Hot air defogging: Due to the high humidity during rainy days in the south, the temperature inside the car may not be high enough initially, so the fog might temporarily worsen. However, as the temperature continues to rise, the air inside the car becomes drier, naturally eliminating the fog; 3. Use specialized anti-fog products, such as defogging sprays or anti-fog towels. Spray these defogging agents onto the inner surface of the car glass and wipe them clean. This not only removes dirt from the glass but also forms a transparent protective film on the glass, preventing water vapor from condensing into fog. One application can provide anti-fog effects for several days.

[LeGraham]

I often drive in cold and humid weather, and the fogging on the windshield is quite annoying. The solution is to immediately turn on the air conditioning for cooling or heating, adjust the air vents to blow directly at the glass, and switch to the external circulation mode. This quickly removes moisture and cools down the interior. In winter, I also warm up the engine for a few minutes first to let it heat up, then use the warm air for more efficient defogging. If I'm in a hurry or the fog is light, cracking the window slightly to allow air circulation can also solve the problem. Safety comes first—never risk wiping the windshield while driving or pull over to handle it; try to move to the side of the road first. Prevention is also key: avoid leaving wet clothes or food inside the car, and regularly wipe the interior glass with anti-fog spray to minimize fogging. Remember to check that the wipers and washer system are functioning properly—keeping everything well-maintained ensures a more worry-free drive.

[LeTimothy]

Having driven for most of my life, I know that foggy windows are both common and dangerous. I’m accustomed to pressing the defog button immediately to activate the air conditioning system’s dehumidification function. When there’s no button, manually switching to external air circulation and directing airflow toward the windshield works best. Years of experience have taught me that cracking the window slightly to allow air exchange also helps, or gently wiping the glass with a clean, soft cloth—but only after parking to avoid distraction. Fogging signals a significant temperature difference between the inside and outside of the glass, with high cabin humidity being the main culprit, such as when rain or passengers bring moisture into the car. To prevent issues, I regularly check if the AC filter is clogged to maintain system efficiency. I avoid using recirculation mode during long stops to prevent moisture buildup. Safe driving is paramount—if fog appears, stay calm, keep steady control, and address it gradually.

[McLucy]

When I was a novice driver, the fogged-up windows really startled me! Now I've learned better—just press the defrost button on the dashboard to let the AC automatically activate the dehumidifying and cooling function. A simple press, and whether it's cold or warm air blowing towards the glass, it clears up quickly. Without an automatic system, manually turning on the AC at a low temperature with external circulation also works. On short trips, cracking the window slightly for ventilation is quite practical. Fog usually forms due to temperature and humidity differences; turning on the heater inside or having many people breathing can easily cause it. For prevention, keep fewer wet items in the car, and shake off water from your coat before entering on rainy days. I've also tried anti-fog film on the glass—it works okay but requires regular maintenance. In short, don't panic when dealing with it; safety first, stay focused.

[CoreyLee]

Fogging on the inside of the glass is caused by condensation due to temperature differences. Understanding this physical principle makes handling it more intuitive. It's recommended to turn on the air conditioning in dehumidification mode or directly blow warm air to defog after starting the engine, and always use the external air circulation to let dry air in. Slightly opening the windows to promote airflow is also effective. Prevention is key: keep the interior humidity low and avoid using recirculation mode, especially in cold weather. For tools, applying a specialized anti-fog spray to the interior glass to form a moisture-resistant layer works well, with regular wiping to prevent water stains. While driving safely, prioritize using the air conditioning buttons for operation instead of manual wiping to avoid distraction. Pre-warming the car when parked during significant temperature changes can reduce the likelihood of condensation. All these measures help maintain a steady driving mindset.