He said he was smelling a chemical smell from his heater.

These properties are in Lima, Ohio which is an industrial town with an oil refinery, chemical plants, US Military tank plant, ford motors and couple other big businesses. 

Then you use several other chemicals that stop them from reproducing and run everything in the house through the dryer multiple times.

Most recently, I've been a clinical social worker working in chemical and crisis mental health settings and published an academic text after completing my graduate assistantship in 2012.

Some background about me: I grew up in the Houston area, studied Chemical Engineering at LSU (Geaux Tigers!)

I’d figure out who the local chemical suppliers are and give them a call.

There are sprays that not only remove mold, but leave a prevention chemical on the surface.

All seemed ok since he seemed to not understand anything. 2 weeks after closing I finally got him out and was cleaning his apartment and found many bedbug treatment chemicals, I asked him about them and he said "about a month ago I had a problem in my unit and another, but I treated them."

Here in Pittsburgh, we get a f***ton of ice and snow and I am an expert in shoveling it and melting it with chemicals.

Recommended treatment is to get a particular chemical treatment once every 5 years.