Some methods of cleaning bowling balls would be:
(1)Leave your bowling ball out in the sun to drain the oil out of it by placing it in a plastic bag with some fresh kitty-litter in it. (Advice Courtesy of Brenton Davy)
I would advise not leave a ball out in the sun sitting on the concrete for too long on its own - I did this a couple of months ago in 34C heat for an hour and ever since, the ball has hit like an easter egg.
2) If your in a cooler climate perhaps you might like to try sitting the ball on the floor in front of a two-bar heater, supervised of course.
Making sure that you are moving the ball around to get the heat to every part of the ball to drain the oil out of it.
Personally I also use this method if I'm in a bit of a hurry or it's a cold day but, whatever you do, DON'T get the ball too close to the heater for too long.
Two bowlers who shall remain nameless from Hobart did this and ended up with bowling balls that resembled round-shaped jigsaw puzzles afterwards.
3) See your back-end mechanic and ask him if he will give you a half-cup of lane cleaning fluid and put it in a 600ml Mineral Water bottle and fill the rest with water (George mentioned this one in anothing posting in this section) the first day I tried this I chucked a 752-series so it does work...well, for me it did anyway.
They're just a few things you might like to try.
I'm no expert but if it works, thats good.
Also see another posting on this section relating to New Balls and Old Ones there's some info in that from some very knowledgable people there.
I hope you find a solution