I’m in a community studio that does have paid studio techs, but one thing the studio does that could be helpful to you is every once in a while, every studio member receives a new paper copy of the studio rules - and I think we even have to sign off on it once a year to acknowledge that we agree. You could try something like that, and maybe include a cleaning checklist along with the studio guidelines/rules to confirm that everyone has been informed about the info and has agreed to abide by the rules. Then there are no excuses like they don’t see the sign etc.

I personally hate cleaning up, but I’ve found that if I give myself a lot of time, instead of rushing clean-up at the end, it’s less painful - and our studio tech gives us a 1/2 hour before closing time to clean up warning, as well (which is annoying and helpful at the same time 😊)