What if there is an indelible carbon deposit on the accelerator?

Generally speaking, it is best not to clean the throttle frequently, because after all, the throttle, especially the butterfly valve plate, is a wearing part, and even if it is to be cleaned, it is necessary to use a special cleaning agent for the throttle. If ordinary cleaning agent is used, it will clean the lubrication of the valve plate's flap bearing, which will affect the use. As for what is not cleaned, you can clean it with a clean cloth.