I use a Shark hand held w/a rotating brush. It's amazing how much chalk they pick up. Before everyone starts hollering about not using a rotating brush, I use them a minimum of once per week on our 3-Diamond bar boxes w/860HR cloth. Our cloth was last changed 09/15 by Josh Ebert and they still look good. We have 14-16 teams that play Mon.-Thurs., free pool all Sun., and Tourneys at least once a month on Saturdays. If the rotating brush is hurting them, you can't prove it to me. I also keep our balls impeccably clean and twice per month wet wipe them with a extremely hot Woolight solution( per RKC ). Brian.