Hi Paul,
I use a combination of a brush, compressed air duster to blow off the dust, and I use maplin electrical solvent cleaner which I believe to be a trichloroethylene based cleaner/degreaser, though it doesn't say so on the can. It certainly works well on brushed motors and general cleanup of greasy and dirty stuff like the canned trichloroethylene I used to get back in the day.
I'm new to brushless motors (4 race meetings), so not had to do any more than airdust off the dust to mine. There certainly isn't the carbon build-up that comes with brushed motors, so should require less cleaning in that respect. Main thing I see to worry about is the bearings being free of dirt and nicely lubed, and the sensor area being free of dirt, soil etc.
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