Where is the carbon deposit cleaned by the engine at high speed?

When the engine runs at low speed, the economy and emissions are in a poor state. Specifically, the fuel is not fully burned, and various harmful emissions and solid particles are produced on the side and accumulated on the combustion chamber wall. Fresh air enters the intake manifold through the air filter, air flow meter and throttle valve, where it is mixed with atomized fuel sprayed by the fuel injector, and then enters the cylinder for combustion through the intake valve. In this process, deposits will be produced in three places: throttle valve, intake manifold and intake valve back, and the inner surface of cylinder head in combustion chamber. In the process of high-speed pulling, the high-speed airflow in the intake pipe will take away the deposits, and the full combustion in the cylinder will burn the deposits and finally discharge the deposits out of the car.