Bucket Method: (as I use it anyway)
Basically you get a 5 gallon bucket, or a wash tub, or whatever is handy to hold enough water to completely submerse your ball.
Duct tape over all the holes so you don't get any water absorbed into the balls core. Now you place the ball in the bucket, tub, what have you and fill with as hot of tap water as you can find. Let it sit for 5 minutes or so and then gently clean the surface of the ball while it's in the water with a towel or one of those buff-a-ball thingy's for a few minutes.
After you're done (take off the tape) and use some sort of cleaner to make sure and get any tape residue off the ball. Then you are all done
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Worrying is like a rocking chair. It gives you something to do, but it doesn't get you anywhere.