I bought some balls from thrift store and they work okay even though they dont hit the pocket like they should. My balls are storm trauma response, Columbia backyard bully, and angle evolution. I would like to figure out how to get the oil out of the ball and keep them clean.

In addition to what Blesseddad posted:

Here is a link to the hot water method:
http://www.morichbowling.com/Education/Cleaning.aspx

These balls that you bought from the thrift shop - did you have the spans checked and adjusted by your proshop so they are correct for you?