How often should Jetta's throttle body be cleaned? How to pay attention not to be blocked at ordinary times?

The throttle body has different cleaning intervals due to different models. For example, Jetta 2-valve models need to be cleaned once every 7 or 8 thousand kilometers, and the time interval of 5 valves is longer. When running at low speed for a long time, the valve body is easy to get dirty. Reducing short-distance operation is an effective method to reduce valve body fouling.