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Lots of ways suggested above. All good for their practitioners! A Dremel / flex shaft with speed control is useful. The thin brass and stainless steel brushes do a good job. Again, the bristles of...

Assure that you really are sanitary with this method. The broken glass fibers can enter skin wherever they lie. Don't Ask!! Yes, a serious pain in the butt!
They can be used and, perhaps, should be...