Let's put it this way: If I own property, who is the State to tell me what I can and cannot do in it/ with it, provided the activity isn't illegal or harming anybody else?

If the walls are painted with latex paint, DO NOT USE TSP as it will do more harm than good.

There really no harm in it...

I'd be willing to accept a poorer finish in exchange for less harmful chemicals in the process.

Either that, or if neither can agree on an arrangement you are both comfy with, keep self managing ... no harm, no foul.

It is in the name of my llc, so I don't think they can harm my credit personally.  

It is in the lease agreement that the tenant is responsible for pest control and that the landlord is not responsible for pest or any harm they cause.

I am not sure this makes any difference in tenant happiness, but it probably doesn't cost you much so no harm either.8.

I couldn't sleep at night if I knew a child was harmed by a dog I allowed on my property. 

@Jonathan Harms, this answer sucks, but all the basics that work for sourcing single-family deals for for multi-family deals (large and small) There is no huge delta between work works on one asset class versus another.