How to Defog Car Windows on Rainy Days?

[Blakely]

If the rain is not heavy, it is recommended to roll down the front and rear windows slightly to maintain a relative balance of temperature and humidity inside and outside the car. If the rain is heavy and opening the windows is inconvenient, the only option is to turn on the air conditioning and direct a strong flow of cold air at the windows, which works very quickly. Most modern cars have heating wires embedded in the rear window glass, which can be used during rainy or snowy weather. For fogging on the side mirrors, there isn't a very effective solution; generally, the only option is to wipe them with a cloth.

[DeSpencer]

I've got experience with foggy car windows on rainy days. When you get in the car, first turn on the AC cooling, switch to external circulation mode, set the fan to medium speed, and aim all the vents at the windshield. The key is to press the defog button—that fan-shaped icon button on the center console—which automatically adjusts the AC to the best dehumidifying mode. The fog will clear in just a few minutes. If the rear window also fogs up, press that square-shaped heating button. Remember to clean the outside glass with wipers before driving, and turn off internal circulation in traffic jams to prevent breath moisture from building up again.