I've used a good portion of bowling ball cleaners. Most are medicore to bad at best with the exception of Track's Clean and Dull and Clean and Polish. I've also used household cleaners like 409, Fantasic and Simple Green. They seem to only work when there is oil on the very surface, or if you can get the ball warm enough to get the oil to the top.
I bought a product called Zep (Citrus Degreaser and Cleaner) at Home Depot. It was actully intended for household cleaning. I tried it on one of my bowling balls and loads of oil and dirt wiped off the ball instantly without effort. I couldn't belive it. Less messy and cheaper then most of the so called good bowling products at a cheaper price. It's also great for household cleaning and steam cleaners! Three times better then Simple Green and I was a huge fan of thier product. Mabey it's not a secret at all but I thought I'd share that this Zep is incredible. I have a mini spray bottle of it for my bowling bag also. I don't know how easy it is to get or common cause I just now heard of it.

Hi Brian,

Thanks for the information on Zep.  I am curious, though.  Have you
tried cleaning a ball with Clean and Dull and then cleaning it with
Zep to see if it removes any dirt left behind from Clean and Dull?

Anyone know if it alters the ball in any way? Hardness, surface etc? Approved by USBC??
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http://www.bowlingkingdom.com

I have not tried this on my bowling balls, but I can say that we use Zep cleaning products (general degreasers, floor soap, hand soap, hand cleaner) at our auto repair shop, and they work very well.
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Jon (in Ohio)
CHROME WON'T GET YOU HOME!
F.O.S. Proud Saw user...see profile.