I am lucky/unlucky, I guess. My wife was the President of one league, now the Secretary, Team Cpt of another, now Secretary of another, grandkids to pack up so I had/have time to wipe down all the balls before we go home. I do that right then and there. I use my own creation of cleaner, a couple days later, if needed, I'll use Clean N Dull, but only if needed, so to answer your question, as charlest has said, a small bottle of cleaner and a rag doesn't take up that much room, I clean them before we leave.
If you think about it, even if you don't have the room in your bag, buy a small tote bag, put your cleaners in there, the cost of that greatly is a savings over a resurface or a new ball.
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AZ Guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.com