Flush toilet 4  vac out water5 remove two flange bolts 6 clean flange and put new wax rings on7 place toilet on new flange bolts tightened bolts8 reinstall water line 9 check for leaksit’s an easy job that should not take long at all. 

Is there a world where it makes sense to leave parts of the dry wall up and try to just clean them?

My tenants all get along and the homes are very clean every time I pop in to collect rent in my lock boxes some people drop cash in.

Selling the house would provide a clean break and cash out the equity for investment in a multifamily property.

I can say she left the place clean other than she violated the lease terms by smoking in it and busted a hole in the air return box.  

Cleaning the landscape makes a huge difference.

There are 3 safe harbors available to you-De Minimis Safe Harbor ElectionSafe Harbor Election for Small Taxpayers (sounds a bit condescending)Safe Harbor for Routine MaintenanceCheck these out...Frankly given the amount, and what you are doing (low materiality to the plumbing system unit of property), I would expense it.

He explain that to remove the dust, I could clean the areas very well.

We used to do pet deposits, but now we collect a one-time "pet fee" upfront that is designated for damage repair and cleaning on the back end. 

Sometimes, money can motivate people to actually clean up their properties.