Daniel, this isn't exactly like our calipers, but pretty close, and gives you an ideA what I'm talking about. The biggest difference with ours is that the dust boot fits in a groove, And is held in with a wire ring....kind of like a big circle clip. This guy in the video uses a hand held wire brush, I used an air powered die grinder with a soft wire brush in it.
http://m.youtube.com/watch?v=cRUOChic7bc

Hope this helps.... There's not much to it, and no black magic involved!