ive never used iso alcohol, roy, have you found it leads to any cracking?
ive "heard" it causes the cover to get dry and brittle.
i use Track Clean N' Dull, gets the belt marks and oil out of the ball.
i got 3 balls cleaned up after league in 10 minutes, even after massive melt marring.
i wish i had a ball spinner, the results would be even better.