@David RobertSevere nicotine damage can require extensive cleaning, sealing, and even replacing drywall or HVAC ductwork.

Quote from @Youssef Pullman: Where do you guys get your cold calling lists from in dallas , Houston texas , am struggling finding a good data to work with and i have a team of 2 cold callersHi, the best quality data comes from 1).

I also run a cleaning business in Las Vegas that works with a lot of real estate investors and property managers, which has been a great way to meet industry professionals.

The mold is like surface mold that can be cleaned with a household cleaning solution and a wet cloth, then dry the space out.

A clean food and clean water source are.

Either way you go, I echo what @Stuart Udis said, surround yourself with a quality team.

For example things such as how to handle certain soil conditions, working with certain agencies, specific water quality requirements (which you mentioned).

Quote from @Jules Aton: Quote from @John Underwood: Our cleaners take the trash with them after each cleaning  With them like in their car?  

I would have recommended getting it cleaned out.

2x gutter cleaning, lawn/snow maintenance, etc?