How often is the throttle valve cleaned?

The engine will produce carbon deposits during operation, and the carbon deposits of many parts need to be cleaned regularly, including throttle body, idle valve, air intake, fuel injector, combustion chamber, oil gallery, three-way catalyst and so on. These parts need to be cleaned separately. If the vehicle is driving in the urban area for a long time, it is suggested that the vehicle should clean the throttle body every 15000 km due to poor driving conditions.