I used to get as many as 5 calls per week to repair garbage disposer, or unclog them and now I get zero calls from my tenants for disposer because I removed all of them and told the tenants to wrap their garbage in plastic bags. 

Provide 3mil thick large plastic bags, boxes, etc. to make their move easier.

Evidently, he buys retail water and trucks his waste out the door in a plastic bucket.     

From my understanding, you want to turn "plastic" into real cash. 

The mold and mildew was throughout the rooms of the house.At some point, someone decided there was not enough ventilation and the "fix" was to close off the vent ducts, lay plastic on the ground, and install dehumidifiers.

Clays shrink and swell depending on their moisture content/plasticity and you don't want your foundations to do the same.

I have 12 properties and my paper is limited to mostly two little briefcase sized plastic paper organizers with multiple pockets. 

Or worse, once I had the vinyl around the glass cracked by 2 big roofing nails pounded in to hold the plastic shower curtain as a blind.

Get metal silverware, not plastic with metal. 

In any of those cases put plastic over the floor & doors and tape them down around the edges and you can work with the windows slightly open for air flow.