700V - We have varying rules for local and state tournaments around here. Some follow Nationals with the dry towel only, while others follow Rule 18 in the rule book. It all depends on who's running the tournament. It also depends on who's watching. I worked the state open tournament a few years ago and saw a fellow tuck a scotchbrite in his buff-a-ball and proceed to "scuff" the ball he had been using. I told him he'd have to put the ball in his bag for the rest of the series, and he didn't believe me. Heck, I'm a girl - what do I know? So, I got the tournament director to come over and explain the altering the surface rule (which I had already done). The ball went in the bag and I got an earful of nastiness. But, the rules were followed.
I've never bowled in a league that had the dry towel only rule, but it's certainly an option. You just need to propose it at the meeting at the start of the season. If it passes, it's your league rule and must be followed.
Sadly, city association secretaries don't always know the rules. We have a situation right now that's driving me nuts because the local association told a mom that her youth-sanctioned kid could sub in our adult league as long as the kid didn't take any money. I'm pretty sure that's in direct violation of Rule 400, and the kid's jeopardizing scholarship and college sports opportunities.
One more note on your issue. Unless your league has a rule against it, polishing or "buffing" machine use is perfectly legit during league play.
Sorry for the book. I have a bit of Lebowski in me when it comes to following the rules.
Deb