Typically, removing smells from drywall/sheetrock requires either complete removal and replacement or the use of stain blocker primer paints or other chemicals.

There are also wallpaper removal chemicals from Home Depot.

My husband was a Chemical Enginerd 🤭 & has a MBA.

I will pay for trash and sewer though leave a provision that if this is being abused like overfull trashcan fees, or disposing of waste or chemicals, electronics etc improperly will be billed to the tenant.I think that should cover it but I was curious how all that works for these kinds of properties should I make the payment but charge my tenants on the back end or should I have them get it in their names.Also do you usually make that a separate charge or do you include it with the rent payment and provide an itemized account of the charges?

I already am paying them for pest control, but they recommended sealing gaps in the home, installing a plastic barrier, and doing a termite chemical service.

He’s very handy, a chemical engineer by trade, and loves numbers. 

Great flashlights and extra batteries that fit, super long extender ladder, korkers/or other brands over shoe to go over your steel toe boots, GFCI tester, moisture meter, a dog nose, an extender mirror, shovel to check foundation moisture, respirator as some properties have gross smells or chemical exposure, regular retractable tape measure forget the laser one, 5 gallon bucket, zip lock baggies, brown paper bags, putty knife, variety of screw drivers,Are you checking basements?

@Veronica Thomas I have them sign off on a checklist through docusign that has a check-in / check-out column (fans dusted, floors mopped, self-cleaning oven cleaned, shelf out fridge cleaning, microwave inside clean, toliet scrubbed inside and out, cabinets crumb free, no chemicals/furniture/toliet brushes/brooms left on premise, no large garbage items on street curb, etc, etc) .

I'd recommend you try again using chemicals. 

Working as an operator in a chemical plant.