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I've used a dremel fitted with a little black nylon brush in the past.
I've tried this in conjunction with various liquids and pastes, including paraffin, gt80, autosol thinned with oil and suchlike.
The brushes come in either the std radial disc form, or as a cup, or as a pencil type brush, some or all of which might get into your particular nooks and crannies.
I've also used small bottle brushes by hand, again in conjunction with the same range of liquids and pastes.
Just watch out that the wire core doesn't scratch .. some bottle brushes are more susceptible than others in this regard.
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