The total plumbing approaches $10k, plus lodging and cleaners to disinfect where the sewage went into a unit.  

If it requires anything barely beyond a broom sweep and light dust we have cleaners come back in and finish the job at the tenant's cost. 

Just repurpose the window to make it more modern and look cleaner.

Hiring a cleaner for the common areas is a great option (and it might not be that expensive when the cost is split between the housemates).

We've just found it to be cleaner.

I have had instances where people where trying to claim cleaning issues but my cleaner takes photos with time stamps on them and I sent that to airbnb and they denied the guests claim since the guest purposely tried to create a "cleaning issue" .

So, I've only had to get my cleaner in a few times.My tenants tend to either be too nice or too scared to bother me with small repairs. 

Therapy, House cleaner, prepared meal delivery, promotion at work, avoid annoying co-worker by switching to a new team/office, laundry service, move so you have a shorter commute? 

I've already set up my own checklist for my cleaners to complete.

You simply Invoice your clients your agreed upon %.Property managers pay the cleaners and staff and invoice the owners.