Try thinking about being in their shoes.  

Just putting myself in your renter's shoes...  

So, they can actually be your eyes on the condition of the property.In your shoes, if you think they are causing the problem, I'd suggest you have a pest control that must enter the unit as well as spray outside - once a month.  

I've never been in your shoes, but I'd send the PM a letter, professionally describing and documenting all of the issues you've had, ending the contract in writing and respectfully requesting that they return my deposit by x date (make sure it's in line with what your contract says).

Looking back, I think a few things I did right (at first by lucky accident, and later by deliberate planning) made this possible:1)I timed my appreciation plays very well ... not that I nailed the absolute bottom of the market upon purchase (though I have), but like horse-shoes, hand grenades, and nuclear warfare, close is sometimes good enough.

You wouldn't be required to report anything, but if I was in your shoes, I'd report it.  

If so, visit them at their place and you'll get an idea of how tidy or not they are. 2) One problem I had was it was my PRIMARY residence, I do things like take my shoes off when I come in, and sometimes other people do not.

I try to donate clothes coats and shoes, sell decent furniture items so the buyer has to carry them away then bag up the rest and send it all to the dump.

Understand you may get a reasonable inspector or one whose shoes are too tight and who is going to go by the book on everything and who will simply drive you insane failing you for unbelievable stupid things.Then decide if all of this is worth it.Gail

I am sure they live there, not staying over, because I saw his clothing & shoes in the closet in the room, with a few boxes of size 4 diapers that can only be for his son but not the tenant's youngest daughter who is going to be 3 yo soon.