A stiff wire brush on a dotco (right angle die grinder) would probably do the trick. For that fact a regular die grinder would probably work OK. After using a dotco for 30 years I'm kinda partial to them. 
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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