This rule is stupid, but not how you think it is.
Its stupid because there isnt any cleaner known to man that you can simply wipe onto a ball to clean it with that will make that big a difference.
Now, you can soak it in something for a prolonged period, or wipe something onto the surface of the ball that doesnt come back off and changes the ball that way, but just wiping it with a liquid that evaporates, or one that is wiped back off the ball, isnt going to substantially change the reaction of the ball in just the few seconds it takes to clean it.
USBC, grow some brains, please?