Pls becareful guys with what you apply to the surface of bowling balls. Not being a chemist, my best guess is that your getting a bad chemical reaction to that ball using simple green, seen it before. That's why manufacturers recommend certain products only for cleaning, if you don't have any problems with reaction, then fine, but do you really want to save 8 or 10 bucks on a recommended cleaner to destroy a $200 ball?
Discoloration, I've seen a lot of ball discoloration in regards to cold temps. (Left in the trunk) It doesn't have to be freezing temp either, just chilled I guess, but what it looks like is a white-ish film or swirls on the ball(that wasn't there before) and you can't clean it off. Here's the trick, have your shop guy throw it on the spinner(no cleaner needed, just heat) and press on it with a towel as if he's polishing and after a while, the white discoloration goes away. Not sure if that's oil seeping thru to the top and maybe changing the color but I know heat takes it away.
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Rick Leong
Ten Pins Pro Shop
Track Pro Shop Staff
Vise Grip Staff