Ineffective for polishing - it is, at best, an alternative for a towel to wipe a ball's surface. If you want to polish a ball properly, use a spinner (IMHO one of the better investments you can make when you want to build your arsenal and maintain your equipment), or ask at your local pro shop for this nifty service.
DizzyFugu - Reporting from Germany
2010/11 Benrather BC Club Champion
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In my experience, they work pretty well when doing a maintenance polish such as Reacta-shine. If you want the full resurface with the polish included, go to the pro shop.
Also, if you don't have the funds to just go buy a spinner or take your stuff to the pro shop every week, these work great.