How often is the throttle nozzle cleaned?

Claim: In most cases, it is more appropriate to clean the throttle valve up and down 20,000 kilometers. Nozzle: If there is no abnormality, don't clean it, or clean it 80,000 kilometers up and down. Car owners have a misunderstanding: they think that washing cars more is good for their cars, but I don't think so! In short, it can't be removed if it can't be removed. It can't be cleaned, and it can't be cleaned when the engine is shaking and accelerating at idle speed. Most 4S shops take cleaning the throttle nozzle as the first operating standard. Because of the same maintenance as last year, throttle cleaning and nozzle cleaning are the simplest and most convenient. If there are still problems after cleaning, further inspection will be carried out!