Volkswagen Tuang rearview mirror heating, how to defog Tuang rearview mirror?

Volkswagen Tulang's rearview mirror heating and defogging function button is located in the control area of the main driver's door rearview mirror, as shown in the following figure. The button on the lower right of the knob is the rearview mirror heating and defogging button. The heating function of rearview mirror means that when the car is driving in rain, snow, fog and other weather, it can heat the rearview mirror through the electric heating wire embedded behind the lens to ensure the clarity of the lens surface. In rainy and snowy weather, press the heating switch of the rearview mirror, and the indicator light on the button will light up. Within a few minutes, the electric heater will heat to a fixed temperature, usually between 35 and 60 degrees Celsius, and the left and right rearview mirrors will emit hot air (if the outdoor environment temperature is relatively low). At the same time, the water droplets on the mirror surface of the rearview mirror will become smaller and smaller due to temperature rise and evaporation, and the fog will slowly disappear, thus achieving the effects of heating the lens, defogging and defrosting. The rearview mirror heating key and the rear window defrosting and defogging function key are placed on one key, that is, after the rearview mirror heating key is pressed, the rearview mirror and the rear window of the vehicle are heated at the same time to realize the functions of rain removal, defrosting and defogging.