I am working through the CBU cleaning in the thread on that topic. If you check the linked Flickr account you can see lots of photos. I just put down my cleaning tools about 30 minutes ago.
A detailed guide would be about 150 pages long. (I used to write technical manuals, including a few in the 500+ page range.) There are lots of steps to consider if you want to clean the boost hose, EGR, throttle, intake, and ports.
I know what you mean about the details. The guides out there say something like 'remove the intake', but fail to mention the 200 separate actions required to get that done.
So far the hardest problem I have faced is removing the swirl flap actuator motor plug. The rest of it follows pretty well once you start. This is my first BMW wrench work, short of dealing with a 1970 R75/5.
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