This eradicates the risk of him taking the deposit, then moving out without a forwarding address for any potential bills to be sent. 

(morality & ethics should be present)    Another good example:  Charles Poliquin (he coached more Olympic athletes that anyone) one of his last conferences a lady in the audience asked him, about how he trains/ diet plan for elite vegan athletes. 

I am also going to hire a professional mold company to come in and test what is left after you tried to eradicate it.

A healthy diet of realistic expectations, patience and some work should pay off more times than not.

They can tear up flooring, scratch holes walls (once had a less-than-wise tenant keep his dog shut in a room - the dog scratched multiple holes in our drywall, as well as obliterated both the bedroom door and closet doors), and urinate on the floor (if it gets into the subfloor, its nearly impossible to eradicate).   

You can charge a fee or higher rent but it does not change the fact that you risk having to redo floors, eradicate urin smell, replace molding and door frames etc.

Daily exercise, proper diet, getting enough sleep, and quiet time. 

@Jeremy MangenRoaches are difficult to eradicate.  

Even the smaller German ones can be eradicated in a few trips across a couple of weeks.  

Setting up marketing systems and doing the work is the diet and exercise protocol though in a world full of binge dieters.