scotts33 is correct! Here is what the rule book says:
Commonly Asked Questions – Rule 18
18/1
When can an acceptable cleaner be used on a bowling ball?
Unless otherwise provided by league or tournament rule, cleaners designated as acceptable by USBC standards can be used on bowling balls at any time during USBC competition. For a complete list of acceptable cleaning agents, see bowl.com.
18/2
When may I alter the surface of my bowling ball?
a. Cleaning – Cleaners approved for use anytime may be utilized before, during or after certified competition Cleaners approved for only before and after certified competition may only be used during these times.
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah
Brunswick Pro Shop Staff
www.brunswickbowling.comThe opinions expressed are solely those of the writer and not of Brunswick Corporation.