It should be spent on your system of review and offers to achieve the highest number of offers you can without just spraying offers out there, which will only cause burn out for you and the agent putting the time consuming offer process.I can tell you that I have seen one pattern I am able to discern.

Does this mean hiring a pest control company or does this mean by something like RAID at the store and spraying it everywhere?

If you make decisions, or if you predetermine future events based on the way they "sound", you are going to miss out on a lot of great opportunities.If the first time anyone heard any of the following statements:1 - I can build a set of monkey bars, out of wood, wire and cloth, and it will allow me to fly,2 - I'm going to take a bunch of "1's" and "0's", string them together in different patterns, and it will allow me to think about anything faster than the speed of light.3 - I'm going to eat a white oddly shaped ball, that came out of a chicken's....and it will taste great.4 - I'm going to collect and drink a whitish liquid that a cow had sprayed on the ground, and it will taste great....the words, "it sounds too good to be true" were overheard, and none of the above were done because everyone that heard those words believed them, we may never have the use of a computer, and airplane, and would not have been able to eat breakfast when hungry.Money doesn't make a noise, so money decisions shouldn't be based on what you hear...but by what you see.Credit cards work, if you are disciplined enough to work fast enough to pay them off before the interest kicks in.  

It does stink a bit on its own so an air intake is good.On that big of area of the whole house spraying might be best, quickest,most efficient.

get lots of aerosol cans and spray those.  

MY suggestion is commercially spray paint it.

There is also an old 2000 SQFT building with two bays, a large spray booth, and an office.The rents I was offered were $600-800.

New roof, new ceiling, upgraded appliances, spray foam insulation in the crawlspace, added a heater to the crawl space etc... 

If tenants do that, can the landlord ask for expenses to clean up anything left behind (or from anything similar for example spray-painting something or building furniture)?

A male will spray and every day additional damage piles up.