How often and how much is the BMW accelerator cleaned?

How much does it cost to clean the BMW throttle once? BMW's throttle is cleaned once, 400 yuan. Cleaning method of BMW accelerator: 1. Buy a bottle of carbon cleaning agent from a reliable source, open the front cover, find the engine and the air filter tube, and loosen the hairpin screw on the side of the air filter tube near the engine. What you see now is the electronic throttle connected to the engine. 2. Spray the cleaning agent on the electronic accelerator, wipe it with deerskin cloth, repeat the operation, and clean the parts that are difficult to wipe with a cotton swab; 3. Turn the car key to the on position and continue to wipe it until the black substance in the car is cleaned up. After wiping, let it dry for a while. Finally, reinstall the air filter tube hairpin and tighten it. Ok, the cleaning work is finished.