Is there a throttle for car maintenance?

The maintenance manual says that the throttle body should be cleaned every 15000 km.

The throttle valve of gasoline engine, also called throttle valve, is used to control the intake air flow. In fact, it is the same as the throttle valve. When you step on the throttle, it will open. The deeper you step on it, the bigger the opening and the more air intake. The electronic control unit calculates the required fuel injection quantity according to the air intake to ensure that the engine has sufficient power output.