I have been cleaning up the entire engine with a combination of dremels (with small rasps and other attachments), and a drill with a couple of different wire brush heads, and a few brushes (including used electric toothbrushes- which actually work quite well for cleanup....) Also I have used some light wet/dry sandpaper and a lot of old t-shirts =)
But - i take my time and am pretty thorough/focused - it helps with me ADHDish brain to have something to sit and focus on for long periods...and its pretty gratifying to look at once you have redone the whole damn engine "by hand"
Still, I had the exhaust mani, turbo elbow, and something else sandblasted as well....cause of the materials and condition...
Kinda just depends on if ya like to do the work or if ya want it done now!
regards,