Whizzing
Brushes
click to enlarge Dremel Part# 404.
Relatively soft nylon bristles in a cup-shaped brush roughly 13mm diameter.

Too soft to have much effect on the coin. No doubt it did abrade the surface, but it was too gentle for this experiment. More...
click to enlarge Dremel Part# 405.
"End-shaped" brush with nylon bristles. Approx 4mm diameter.

By far the most successful - if the intent was to polish without damaging severely.
I doubt if this brush can actually "whiz" within the meaning of the term.
"Gently" whiz, maybe. "Polish", certainly. More...
click to enlarge Dremel Part# 443.
"End-shaped" brush with carbon steel bristles. Approx 3.5mm diameter.

Who-o-o-a there, pardner! This one is a bit vicious. Scratches are deep, and metal is removed (not "moved") real fast! More...
More on these (and other) brushes at Dremel's site.
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