How to clean the intake valve and throttle valve?

How to clean the intake valve and throttle valve? Generally speaking, it is recommended to clean the intake valve and throttle valve every 30,000 kilometers. The five functions of regular valve cleaning are as follows: 1, which can effectively clean and remove the glue and carbon deposits in the fuel nozzle and keep the fuel system clean; 2. It can clean the waste gas circulation system, reduce waste gas emission and save fuel, thus effectively protecting the oxygen sensor and the three-way catalytic conversion device; 3. It helps to prevent the explosion, unstable idle speed, poor acceleration and other symptoms caused by colloid and carbon deposition; 4. It can eliminate the carbon deposit on the valve seat, lubricate the valve and valve guide, improve the sealing performance, restore the cylinder pressure and increase the power; 5. It can clean the carbon deposit in the combustion chamber, lubricate the upper part of the cylinder, reduce the wear of the piston ring and prolong the service life. @20 19