A few months ago with a wire brush I brushed marine life off an old nibral prop that had just been pulled off the boat. It was one of those common wood handle brushes with hard steel wire bristles that were about an inch long, five inches by an inch wide pattern. I was about half done and got interrupted to do something else, leaving the brush and prop laying on the dock. About an hour later I came back and the wire bristles on the brush were gone! When I left them they were an inch long, when I got back they looked like they had been shaved down to within an 8th inch of the handle. What happened?????