How to clean the carbon deposit in the intake manifold?

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The cleaning method of carbon deposit in the intake manifold is to remove the intake manifold, dip it in gasoline with a 2-3 inch brush for 2-5 hours, then remove and eradicate the carbon deposit with a large-sized spade or a small shovel, erect the intake manifold, and tap all parts of the intake manifold with a hammer until the carbon deposit is completely removed. The intake manifold is located between the throttle valve and the intake valve of the engine, so it is called a manifold, because after the air enters the throttle valve and passes through the manifold buffer system, the airflow channel branches here, corresponding to the number of cylinders of the engine. For example, there are four four four-cylinder engines and five five five-cylinder engines, which respectively introduce air into each cylinder.