Whats the easiest way to clean them if you work at a poolhall that has about a dozen of 9foot tables with ball return? The tables we have, they are hard to clean, you have to lay on your back to wipe them with a damp rag. Would wetting a tennis ball and rolling it thru work? How about glueing some fabric on a billiard ball and pulling it tight so it's round and will roll? Any advice is appreciated.