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I've seen a few pages that suggest a camel hair brush for dust removal. I don't know whether a brush would be advisable if they're filings though.
I've used a goat hair brush (from an art store) for dust removal. I gather camel hair is the softest, but I think goat hair is the next best thing.
I rub the brush back and forth on a plastic surface (a calculator cover) to build up a static charge in the bristles. That way it picks up everything with barely a touch. Then rub it over the edge of the plastic again to dislodge what it picked up and 'recharge' it.
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