Is it necessary to clean the throttle, injector, intake system and three-way catalyst? How much is once in a while?

These parts need to be cleaned, which will form carbon deposits after a long time. Excessive carbon deposition will lead to unstable idle speed, insufficient power and increased fuel consumption, so it is necessary to clean up carbon deposition regularly. Generally, the throttle valve is cleaned every 2 kilometers, the fuel injector and air inlet are cleaned every 4 kilometers, and the three-way catalytic system is cleaned every 6 kilometers.