I have no first hand experience, but had researched this when I was considering restoring original hardware. They make small ceramic pyramids which are good at removing old paint and rust. For something soft like carb bodies, I believe corn husks or walnut shells would work well. This also works well for a final polish of your fasteners.
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-Jeremy
1968 GTO 4-spd convertible, console, factory gauges, hidden headlights, 3.90:1 posi, AM/FM radio.
1962 Catalina convertible, Starlight black w maroon interior & white top.
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