How to clean salvage copper pipe

[LeftyStiller]

I just sourced some 2” copper pipe from a local metal recycler. Now I need to clean it. I have a handle on taking care of the outside of the pipe but the interior seems “greasy” in places. I figure the first step will be to degrease them all first, then I am using a rough AO coated 2” wheel welded to a 24” rod and am going to chuck that in a drill. Then citric acid or vinegar bath.

Basically, just reaching out to see if someone has a better way to clean the interior of the pipe.

Thanks,

Lefty