Is it necessary to clean up carbon deposits with walnut sand? How often do you clean up the engine carbon deposit?

A cyclist recently asked this question. It is estimated that it was mentioned by the maintenance master when he went to maintain or repair, so I want to know if it is necessary for Mercedes-Benz to clean up the carbon deposit with walnut sand. Let's take a look at walnut paste. Walnut paste is a small particle made of walnut shell. The principle of removing carbon from walnut sand is to put walnut sand into the equipment, which is powered by compressed air, and the compressed air establishes working pressure in the pressure box. The walnut sand is pressed into the sand conveying pipe through sand cutting, and then sprayed out from the nozzle at high speed and enters the air inlet of the engine. That is, using high-speed walnut sand particles to impact carbon deposition. Because it is hard enough to clean up the carbon deposit, and high-speed power can clean up the carbon deposit, but it is not enough to damage the intake, so it is a good choice to clean up the carbon deposit in the intake with walnut sand. In addition, in recent years, due to the gradual popularization of equipment for cleaning carbon deposits in walnut sand, the price has gradually decreased. According to different situations in different places, the minimum can be cut to several hundred yuan to several thousand yuan. It's good to have a score in mind when you do it. Finally, walnut sand cleaning carbon deposits is only useful for air intake system, and there is no way to clean carbon deposits in fuel nozzles, spark plugs, cylinders and other places. Therefore, it is still necessary to intermittently use big-name genuine fuel additives in small doses. In addition, many people also want to know how often it is better to clean up the carbon deposits. Generally, new cars start to produce carbon deposits after driving for 20,000 or 30,000 kilometers, so if they accumulate gradually, they should be cleaned every 50,000 kilometers.