Per Cheech's reply, I have had very good luck with the 5 gallon bucket of hot water method. I put it in the bathtub and fill with the hottest water that will come out of the tap and let it soak. Periodically I pull the ball out and wipe the access oil off with a microfiber towel then adding fresh hot water and repeat until no more oil comes out. Going to the pro shop is an expensive and safe alternative but not all pro shops have revivor ovens. I have also tried the cooking oven with mixed results. I have had it work very well but I have also had a ball crack immediately after using that method so I now just stick to the hot water method. As a side note, make sure you pull any tape out of the finger holes of the ball before heating it or you will loosen the glue and leave a nasty residue inside the holes. Be sure to let the ball dry out well before use. Hope that helps.