What we want is to get rid of the FOUL ODURE first and get the Place fumigated ..
The next inhabitant will need to take extraordinary measures to remove all traces of it.They might try Boric ACID that will kill vermin and then maybe an ionizer to refresh the place also a paint job with oil based paint that usually runs the vermin out of the walls and ceilings.
I cant imagine how 8 years of LIES and DECEIT can be removed from the place ! Its going to take a Saint and maybe a Exorcist to remove the Demonizers from the foul air that permeates the place.