How to clean the carbon deposit of direct injection intake valve in cylinder

How to clean up the carbon deposit in the intake valve of direct injection in cylinder? The method of removing carbon deposit in direct injection intake valve: 1. Add "fuel treasure", the operation is the simplest but not very easy to use. If it is a bottle before the car inspection, it will have a certain impact. In daily use, fuel treasure has little cleaning effect; 2, "infusion bag or bottle", infusion bag or bottle is very similar to a hospital infusion bag or bottle. Inject cleaning liquid into the intake valve for better cleaning. It does not need to disassemble the automobile engine, and it is also an effective cleaning method. 3. Remove the engine and cylinder head. This is the most thorough and direct cleaning method, and the cleaning effect is the best. However, this process is very complicated. Once the engine is removed, there is usually no original air tightness. It is best not to take it down for cleaning. @20 19