lawn mowers & cleaning people still tuff. 

That means gutters, clean gutters, drainage pipe leading away from the house, base pitching away from the house, etc.

If the vapor is coming from the soil, wouldn't the proper way to remedy the situation involve actual soil removal/clean up?

Between renters a cleaning crew can use the key code that’s provided to them and have the unit ready for the next renter.

I have the 1/2 HP InSinkErator Badger 5, so I would recommend it if you won't put everything in it, it's not a garbage bin, just something to help you with cleaning and the sink not to get too dirty.

You're right $2,500 was way too low but the $4,000 in repairs per unit is more of a budget for small repairs like holes in the wall, painting a room, or cleaning a unit.. things that wouldn't necessarily increase the value of the property. 

Step 1-clean thorough. remove any grease/grime.Step 2: sand, to scuff up the surfaceStep 3: remove all sanding dustStep 4: use a bonding primer that works on glossy surfaces.

It was cleaned up and cleared by DEC but spill still under foundation and roads.

Long story short, now he is my eyes on the property so I rarely have to go out to my rentals for inspection as he walks and treats the interiors and gives me an update on how things are looking inside, how clean the tenants are, how many people are inside, etc.   

Our focus is now super clean deals, meaning, high credit scores, low LTV's, low DTI's, 3-4 month cash reserves, for all loans now.