How often do you clean the intake valve and throttle valve?

How often do you clean the intake valve and throttle valve? The intake valve and throttle valve are generally recommended to be cleaned after driving for 30,000 kilometers. More information about the intake valve and throttle valve is as follows: 1. The function of the intake valve is to draw air into the engine and mix it with fuel for combustion; Throttle is a controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, and the combustion is successful. 2. Regular cleaning of the valve can effectively clean and remove the colloid and carbon deposit in the nozzle and keep the fuel system clean. 3. Regular cleaning of the valve helps to prevent explosion, unstable idle speed and poor acceleration caused by colloid and carbon deposit. @20 19