Here's the law in Maryland on those unwanted/unauthorized persons as well as a clause to include in future leases to avoid this:https://www.baymgmtgroup.com/blog/find-unauthorized-person-rental-property/If it were me, I would start by making this the tenant's problem.

If so, offer to leave their unwanted items behind, usually investors will take care of it. 

It saves you getting unwanted calls and waste time.

The good news is this unwanted publicity is, in large part, optional.  

Because frankly, after work, I do not want to deal with unwanted guests in my house either. 

(There's more little old ladies with unwanted property out there.

This way you dont have to leave your unit vacant while you hold on to the likely unwanted items.

You're just inviting unwanted replies.It's great that you want to start investing for cash-flow, that's a good start. 

Make an agreement with your new trust partner that basically dictates you must have a prenup to exclude business assets from your marriage so there are no unwanted future "partners" in the business. 

So your tenants will have to cover everything or take everything out and the insulation will find its way into unwanted places.check out this website and look at the bottom titled decoupling tips:  http://www.greengluecompany.com/products/noiseproo...