Is anyone aware of a potent way to address the fleas and where to purchase the chemicals?

Specialized chemicals and pressure washing would be needed in my opinion.  

They also have chemicals and equipment to clean spots that the "rent from grocery store" systems can't touch.

It must be Food Grade or it's poisonous.It works better than chemical flea killers and is non toxic to people and pets.

Resurants, food preperations, chemical industries and probably oil and gas as well (considering the environmental impact issues).

I dont mow but own a chemical lawn care business.

Ok finally I can do this post I wanted to tackle it before but i ran into some issues with getting the floor together.Ok so you have a floor that is relatively in good condition but there are a couple of boards that are damaged beyond repairWhat could cause such a thing.heavy machinery being dragged across the floor. fire damage.water damage. chemical spillIf you don't have the time or the money to redo the entire floor but it is just a few boards that are out of whack there is a way to tackle this job without a lot of effort and time. you dont have to do the whole floor. most people will tell you it is impossible to match stain and this is true it is really really difficult but there is a trick that you can do. it is called monochromatic color effect ( i just made that name up but it works )you will need a fine cutting tool like a multi-maxa brush or a rag and three or four colors of stainyou will use the multi-max tool to cut along the seams where the boards meet each othercut down into the seam cutting loose the tongue of the adjacent boardstake your time. if you are cutting a length of board and stopping before the board is finished. then make sure you stagger your lines so that you get the staggered look floors are meant to have.you will need to find wood that is of the same size..

I would go with sanding the floors and staining , since I believe that any/most chemicals you may use you run the risk of having the chemical discolor the floor.

If no one is living in it, they can fumigate and go all chemicals for less than that.That number is for the Chicago area on a 2k sq. ft house.

They'd set a barrier around the property with a chemical treatment and I'd suggest removing any standing wood from the yard.