But people should keep hands off glass cases. It looks nasty when the next person wants to look at whatever is on display. It's a pet peeve.
And you don't touch items in any museum unless you're told you can. That's just common sense. We have some things roped off but the cannons are large and there's really no way to rope them off. Not much room for that.
Wow! Someone has spent some time getting that brass all polished up. No wonder you want people to keep their mitts off them! They look great.
Yes, we practically lived with a Windex bottle and paper towel in hand at the jewelry stores I worked at. We tried to wait till people left before wiping up after them so as not to seem rude, but sometimes it was tempting to spray them with the Windex. LOL!