i want to install a oil catch can and want to get the intake manifold and egr cleaned at the same time and in doing some research ive seen two ways of cleaning the manifold:
1. remove the manifold and clean with degreaser
2. as pictured below using some type of pump and degreaser with the manifold still attached to the engine
![Image](https://image.ibb.co/dHcJYd/IMG_8466.jpg)
my question is, will option 2 do as good clean as taking the manifold off?
im looking at getting it done by a mechanic - not doing it myself
thanks