I'm a 30 year old chemical engineer with a steady job and generous income. 

You can sand it or go "passive/chemical. 

I have seen pictures of the inside but I don't know if any chemicals seeped through the walls.

Tenant agrees not to use caustic drain cleaning chemicals in any of the drains or plumbing fixtures.

My understanding is that the EPA is beginning to ratchet up additional testing for more chemicals and certain states, and that testing of these will initially be more expensive.  

Cleaning grease is a lot harder than I thought, special chemicals still require multiple cleanings...Moving the fridge was an eye opener as the floor was filthy with food grease and mouse droppings they chose not to clean. 

Things like old ovens, random chemical waste, excess trash left behind by a tenant, etc.I used to drive a sedan and I was able to make that work, but having a truck is just a bit easier, in my opinion.

@Bret Allen We provide the house pest-free and will re-treat if reported in the first 30 days.Our lease has had the term "any additional or periodic pest control is the responsibility of the tenant" for at least the 11 years I've been here, and it has been vetted by our attorney.I understand your opinion may differ, but I would rather have a tenant raise the issue of being responsible for their own cockroach problem (we do SFH, so neighbors don't play in) than being named in a suit for damages because somebody had a fatal reaction to our pest control vendor's choice of chemicals. 

We hired a pest company that used a new chemical treatment at the time, which would have been about 2013. 

The prognosis from the cleaning crew was that the chemicals they would need to use to clean it, probably wouldn't make it very safe as a fridge for food afterwards.