How to clean the throttle?

When the engine is running, part of the exhaust gas generated by the combustion of combustible gas in the cylinder will pass through the intake valve, and the intake pipe will generate carbon deposit at the throttle body. After the engine is turned off, the oil and gas in the intake pipe will be cooled into liquid and deposited in the throttle body. In addition, after the air passes through the air grille for a long time, unfiltered air impurities will remain in the throttle body, which will form scale deposits for a long time.