Which button to press for fog inside a Mercedes-Benz car?

[StLorenzo]

The defogging button is a rectangular frame with three upward-curved arrows from bottom to top. Reasons for fog formation: Fog forms when the temperature inside the car is higher than the outside temperature. Other defogging methods: If the fog inside the car is not heavy, you can open a crack in the windows on both sides to create air convection between the inside and outside of the car, reducing the temperature difference and gradually dissipating the fog. The principle of this method is the same as turning on the air conditioning's cold air, but it does not increase fuel consumption. However, the downside of opening windows for convection is very obvious: it cannot be used during rain or snow, on highways, or when the fog is heavy, and it will lower the temperature inside the car.