Do you think that just spraying the perimeter and around window/door frames with your own bug spray would do the job just as well as spending hundreds on a professional?

I would not let a tenant install spray foam insulation in an apartment.

A fresh coat of spray paint on the railing would make it pop too.  

This isn't a normal 2/3 day spray job.

You shouldn't have to tear down any walls unless you choose to do spray foam insulation - and that will cost you at least double of the alternatives (not to mention costs of hanging fresh drywall).What I would do is find a company that does blown in insulation.

A cheap can of spray paint really changes them.

Some police depts have briefed that if you suspect meth in a property to put some spray starch on the walls.

Some double wides bought off HUD or auction.com we just use a spray bottle of cleaner and a vacume and new appliances.  

Some types of small black ants need to be sprayed by knowledgeable exterminators because they will multiply with a poorly conducted spraying and have more than one queen.

Since I let them bring their furry kids to my places, they stay full, I get more rent, and I charge the furry little critters a $500 pet deposit on top of the sec. deposit.Sure, I've had dog holes dug in back yards, cat spray on walls, tore up door jambs, etc. etc.