I think the cleaning 'problem' has been exasperated in recent years by the disintergration of the local group arrangement - on group evening (tuesday?) there would often be the lone publisher or two who managed to remember your group's turn KH cleaning for the weekend, so it was more likely to get done - and a good turn out on f/s as we all stop early to clean the KH late morninging before lunchtime
I attended many congregations that shared with another. The worst was clleaning after a meeting when another congregation would be the next attending one.
For the Sunday, I think it works better to get your own 'crew/group' in early before the meeting and do the cleaning/tidy for your own congregation meeting before the meeting
Of course, if you arrive early enough, before the other congregation have fully left, then all the better...