How often does the throttle of mazda 6 car be cleaned?

Mazda 6, the throttle is cleaned every 20,000 kilometers. Throttle is a controllable valve to control the gas entering the engine. 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 located between the air filter of the air intake system and the engine block. It is a medium-sized car of FAW Mazda in mazda 6. Its length, width and height are 4670 mm, 1780 mm and 1435 mm respectively, and its wheelbase is 2675 mm In terms of power, this car uses two engines, one is a 2.0-liter naturally aspirated engine and the other is a 2.3-liter naturally aspirated engine.