It is the responsibility of tenants too, to keep the rented unit clean to avoid any pest infestation.

That seems to be a huge problem in this country.That does not mean they deserve to live in crime infested warzones just that if they want central air and a dishwasher they should better themselves to pay for it themselves 

Ned Carey, meant to add, I was trying to avoid the shark infested waters of the local REIA, but I guess I'll have to wade in with my alligator bat by my side.

The first tenant has a serious infestation.

scratch that.bank tore out mold infested carpeting and locked it in the shed. they also used thick paint directly over the mold on the drywall.

You will deal with cockroach and rat infestations.

If you have a good exterminator, they can tell how long the infestation has been present.

It was a strict no pet policy to start with (tired of flea infestations, and fighting pet smells/stains).

I have a pro active approach i.e. reporting to roach infestation and leaks ASAP as it it were an emergency.

What is the best way to remove the infestation, or what is the best way to screen a pest control company?