You better install a dryer or heat treat rather than chemical treat.

Vaping still uses nicotine and other chemical flavoring and suspension agents, and be spilled on carpets ,counters etc.Calling smoking by a different name is still smoking.

And, the amount of chemicals they soak the boards in that make up the floor is ridiculous.

I plan to keep the rental for long term so not that concerned about cost but more concerned about tenants not using the self clean feature safely even after education or spraying inside with chemicals.

If you are close to a hospital, Oil / Chemical Refinery, Armed Forces base, etc....then you can cater to those people (i.e. nurses, refinery workers, military, etc.). 

I am flirting with the idea of installing a whole-house water filter to reduce chlorine and other chemicals. 

I am flirting with the idea of buying a whole-house water filter to reduce chlorine and other chemicals. 

We tore out the old kitchen, installed Lifeproof LVP throughout, replaced all the cabinets with Choice Cabinets (which we are distributors for so we get good prices), added an island, Calacatta Glacier Quartz countertops, new vanities, new fixtures, reframed a wall for the storage shed which had termite damage, chemically treated the house for termites, painted, and replaced all interior doors.

In addition, car washes don't hold their land value that well because of the long term environmental impacts of the chemicals used on site.

Refinery, Chemical plant, Tank Plant, Ford engine plant and 2 hospitals make up work force.