When looking at investment property, pet odors smell like money.I bought one of these a few years back and was prepared for chemical warfare. 

Now when you walk it there is a very strong chemical smell and we can’t pinpoint what it is.

Electricity, chemicals, scaffolding, spinning blades, etc. 

Cleaning the air handler coils when dirty, changing filter, using A\C pan tabs, blowing out the drain line with shop vac and using chemicals to deter growth in drain lines all seem to help. 

Oil is used to pave roads, make plastics, produce solvents and other chemicals.

We heard from a garage door contractor he would not put in his garage doors knowing a pool would be in there since the parts get corroded from the moisture and chemicals. 

The tenant wants the guy evicted, she doesn't (shouldn't) have to breathe these chemicals while on the property.  

I would put it in the lease that the tenant needs to pay for upkeep like the chemicals and making sure it is clean.

I am married to a chemical engineer and he absolutely says the stuff Home Depot or Ace hardware recommends is as good as what Orkin is going to spray.  

Bristol - Bristol Motor speedway, NHRA Drag races and now Pinnacle retail market (border city with VA)JC - ETSU (med school, pharmacy school and source for talent), Regional Medical center and newly formed Ballad HealthKingsport (KPT) - Eastman chemicals, also a VA border town and gateway to lower income AppalachiaThings you wont find on the Internet, include the smell of the chemical plant in KPT, and recent fire and community scares related to plant activity.