The best way to revive a ball is to sand it with 220 grit sand paper, and then put it in a bucket with water that is half boiling and half the hottest your tap will give and then add a little bit of dish soap. This will be the right temp to not crack the ball and the soap is used as a degreaser. Leave the ball in for 15 minutes, and then pull it out and wipe it off, then repeat twice more. After all that is done, sand the ball back to it's box finish.
Another thing to think about, bowler's positive axis points will move after time. I had two balls that I thought had died, and upon further inspection, I found out my axis point had moved about 1/4" down. This made my pin length go from 5" to 5 1/4" and made the pin higher than it was before in comparison to my axis point. I plugged and redrilled the two balls back to a 5" pin and they both started acting like they had before. I advise my customers to come in and get their axis point rechecked every 6 months.
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