Just had a look at your blog, nicely done.
With your diff cleaning, I use a brass wire brush fitted to an angle grinder. The brass is soft enough not to damage or mark the casings but stips of the muck and oxidation very quickly and easily. I use a smaller pointer wire brush mounted in a die grinder for the awkward tight areas. I normally use this method for motorcycle engines.
One word of warning, always wear goggles, gloves and a thick top as the individual wires do detach themselves from the wire brush cup and can do a nasty injury unless you are suitably protected.
I find that wire brushes mounted in drills are just not man enough for the job.
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