When I attended the Powerhouse two day Lane Play and Ball Layout course, we bowled at the lanes next door. Jeff Ussery, the Powerhouse manager for cleaners, polishes, etc. (Jeff - I know that's not your official title but I'm too lazy to look it up), used the Clean 'n Dull, from a bottle that was still labelled Track. He should know. He also said that the best way to keep your ball's reaction as long as possible is to faithfully clean it after every bowling session. -- JohnP