"Maxwell" wrote in message
...

I have also seen small rotary wire brushes (designed for a drill motor or
such) bearing mounted to turn at an angle, rotated by only the passing
blade, but scrubing chips from the blade.

Even less sophisticated would be a couple of toothbrush-size wire brushes
mounted, one on each side of the blade and/or mounted to scrub the debris
off the rubber tires. Harborfreight sells some cheap brass brushes which
work well for this.

Rich S.