What to Do When Car Windows Fog Up in the Rain?
3 Answers
Methods to prevent car windows from fogging up on rainy days: 1. Proper use of the air conditioning system: Park the car, turn on the AC, adjust the temperature control to the warm air setting, then press the defrost button to dry the windshield with warm air. For faster defogging, switch the AC to external circulation to allow fresh air into the cabin, and set the compressor and fan speed to 25°C or higher. 2. Use specialized anti-fog products: Spray evenly on the windows and wipe clean before each use to form a transparent protective film that prevents fogging. 3. Open windows for air convection: If the fogging is minor, slightly open the side windows to allow air flow, balancing the interior and exterior temperatures to disperse the fog. 4. Clean with detergent and a dry cloth: Mix water with detergent (ratio 1:6), apply evenly on the interior glass with a sponge, let it air dry, then wipe clean with a towel to avoid watermarks. This method typically keeps windows fog-free for up to 20 hours.
When it rains and the car windows fog up, I encountered this soon after I started driving, and it was a bit scary. Later, I learned several methods: first, turn on the air conditioning immediately, either cold or hot air, depending on the car's condition, and select the defogging mode, with the button located on the dashboard. Then, turn on the A/C switch to dehumidify the air, directing the airflow toward the windshield. If you have a cloth handy, wipe the fog from an area that doesn’t obstruct your view first. When washing the car, don’t forget to clean the inside of the windows, as oil stains can worsen fogging. If it’s raining heavily, crack the window slightly to ventilate and balance the temperature and humidity, but be careful not to get wet. Driving safety is the top priority—if unsure, pull over to address the issue. Fogging mainly occurs when warm breath inside the car meets cool rainwater, so maintaining a good air conditioning system can help prevent it.
On rainy days when car windows fog up, as a seasoned driver, here are my efficient tips: Turn on the fan for defogging, adjust the speed to medium-high, and switch to external circulation to let fresh air in for dehumidification. Set the air conditioning to blow towards the windshield with a moderate temperature—not too hot or cold. Avoid leaving wet items like umbrellas or clothes in the car, as they increase humidity. Regular anti-fog treatments can save you trouble. If the fog is heavy, pull over to a safe spot and wipe it with a towel—don’t multitask while driving. Experience tells me that fogging stems from large temperature differences and high humidity; controlling airflow is key. Make it a habit to check for dry windows before driving for long-term safety.
