i was under the impression that this was already illegal during competition as said above it is altering surface. i know at least usbc collegiate events they site the "dry towel" rule and assumed it was this rule.
No it wasn't illegal heres from last years rule book:
Rule 18 – Bowling Ball – Altering Surface
Altering the surface of a bowling ball by the use of abrasives while bowling in USBC competition is
prohibited.
All bowling balls so altered must be removed from the competition. (See the USBC Equipment
Specifications Manual on BOWL.com.)
NOTE: If it is shown the bowler had prior knowledge his/her actions were in violation of Rule 18, the
game(s) in which the violation occurred is (are) subject to forfeiture. In addition, the bowler is
subject to dismissal from the league and suspension of membership.
Competition is defined as the remainder of the current game and remaining game(s) in the
series being bowled.
The use of approved cleaning agents such as isopropyl (rubbing) alcohol and polishing
machines is permissible.also
18/2 When may I alter the surface of my bowling ball?c. Polishing – You are permitted to polish the surface of your bowling ball prior to certified
competition. However, once tournament or league play begins, the use of a ball spinner is
strictly prohibited;
only an automated, self-contained polishing machine may be used.