How often does Tianyu throttle clean?

If the subject wants to know, "How often does Tianyu throttle clean?" The relevant contents are as follows:

Tianyu throttle 20 thousand kilometers cleaning. Throttle is a controllable valve that controls air to enter the engine. There are two kinds: traditional cable throttle and electronic throttle. After the gas enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work. The throttle valve is connected with the air filter and the engine block, which is called the throat of the automobile engine. Take Tianyu SX420 16 1.6L Automatic Classic Edition as an example. Its front suspension type is McPherson independent suspension, and its rear suspension type is trailing arm torsion beam dependent suspension. The length, width and height of this car are 4 135mm, 1755mm and 1605mm respectively, and the wheelbase is 2500mm.