(1)...I put mine in the sink on a ball cup.
(2)...Then run hot water until it about covers the top of the ball.
(3)...I then use dish washing liquid such as dawn to clean the ball as it sits in this hot water. The oil comes to the surface of the ball due to the hot water, and it is washed off by me rubbing the ball with a dawn dish washing liquid covered rag.
(4)...I do this until no more oil is coming out of the cover stock which takes about 20 mins, as I do this once per month.
I have never had any ball crack, nor have I had any other problems doing this.
I have seen guys put there ball in an oven with heat as low as it would go and still they burned the ball making the cover crack!!
Pro shops use a special oven designed for bowling balls, and yet still...I would never use one of those as I prefer hot water over dry heat!!
This works for me because it is effective, and causes no harm to my equipment as I always dry out the finger holes when I am done using a towel or rag, then I use a hair dryer to blow warm air into the finger holes to further dry the inside of the holes.
I don't really worry about the water that gets into the holes because I have a few bowling balls that I bought from a guy who left them out side in his yard in rain, snow, sun, for two years & these balls work like new after I bought them from him and resurfaced them on my ball spinner.
....But then I do live down south where it does not get below 20 degrees very often or for very long.
I know one guy who puts his bowling ball in his dish washer & claims he has had no problem & claims it works great! ...But I wouldn't know about that myself as I have never tried it.

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