Put a little money into the clean up after they leave and you will find better tenants and may be able to charge more.

Sealers can help but that only gives you more time to clean up the mess.

I've asked him several times to let me clean up his yard.

I usually do the cleanup and painting myself so its just material.  

Purchase, Sale, contracting for rent, repairs, clean up.  

Is the clean-up process something that can be handled by the property owner/manager?

As for the animal urine the tenant says per Arizona law she does not have to disclose a service animal, nor does she have to clean up after them.

Sounds like a great way to clean up some of the mortgage crisis mess if they can make the loan fairly simple to obtain!

You must use lead-base-paint certified contractors and use special removal/clean-up techniques or take the class and get certified yourself to work on your own investment properties if you're doing anything extensive (sanding large area, replacing windows, etc.).

Because you wanted to leave your dirt for someone else to clean up, that's why.