If you follow these guidelines above, you won't have this problem either.What to do now: You can order some cheap roach killers on Amazon and have them shipped directly to your tenants.  

USPS/UPS box may not NECESSARILY be a deal-killer, but it warrants further investigation.Visit the person's current job sites, maybe buy them lunch.

That's what I did, but I have a killer agent also!

Unless it is a really killer steal, your Practical options are probably at best to recoup any Actual expenses on this deal, and move on.

The only killer is the property taxes.

That's a killer rate for a guaranteed return. 

Equity is a cash flow killer.

I am looking at a park that is pretty awful, which too me is exciting because I see lots of potential to take this poorly maintained commercial property and polish it up for some killer profit.

Vacancies tend to be your biggest cash-flow killers; you also said good tenants can be hard to find in your area. 

Or you can just buy commercial grade mold killer at Home Depot and DIY.However, no matter if you hire a service or if you do it - the mold will likly come back if you don't correct the condition it got it to flurrish.