Some of my brushes are quite old with short bristles, a testament to their age. These short-bristled brushes are very handy for reaching into tight spaces, so I try to take good care of them.
If your wire brushes are a little "ratty", try this nifty little trick to bring them back into shape.
Step 1: What You'll Need:
A ratty wire brush. (The one I'm using wasn't this abused, but I wrecked it for demonstration purposes.)
A bench grinder with a wire wheel.
Step 2: How It's Done
Not only will the combing straighten out the bristles, but it will shine them up as well. Now your brushes can live to be as old as mine.
I hope this helps and saves a few old wire brushes from the trash heap... And a few fingers from multiple tiny puncture wounds:)