Since I use only polished solids and pearls, I only use it about once a month or so. If you bowl on "oil" regularly or use dull balls regularly, I can see the need for regular use of C&D. With the prices of balls these days and the sensitivity of some balls to decreased performance, "an ounce of prevention of worth a pound of cure"!!!
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Just like hand grenades and horse shoes, in bowling you only have to get close ...