While open bowling with fellow league friends tonight, I cleaned my ball with some Storm Reacta-Clean (an ABC approved cleaner) between the 1st and 2nd games. One of my friends mentioned that if we were bowling in a league match or in a tournament, that it would be illegal to clean my ball, because by doing so I was altering the surface. I thought that cleaning was okay since I was using an approved cleaner, and using it between games and not during, and did not really think this was altering the surface, like scuffing or polishing would be. I compared it to wiping the oil off your ball after each shot with a towel, but my friend seemed pretty confident and has bowled for quite a while. Anyway, since I'm not really sure who's right, and I need to know before it potentially causes me a problem sometime, I thought I'd check with the resident experts here at Ball Reviews. What do the rules say?