How to Evict Mickey?

[Anna Buffkin]

Help!  I can't seems to properly evict rodents from one of my properties.  

I have a 3rd floor condo in South Carolina with a rodent problem.  It is pre-existing to my tenants and they appear to be clean people.  My cleaning lady first reported signs of a rodent when she cleaned it out in August to get it ready to rent.  I had my contractor out to verify all areas are sealed of.   Additionally, we had a wiring issue where power was cut to one side of the condo which I feel may be the from the rodents chewing.

In total, I have had my maintenance contractor in there twice to make sure all openings are sealed in addition to fixing the wiring.  I have had Orkin come out and now am on to a local pest control company.  We have tried traps and glue boards. We have moved on to some kind of poison trap similar to a roach motel which is suppose to kill the nest.  Pest control said it should take 3-5 days work.  Its been 2 weeks and 3 more have been spotted.  

I am already a couple of hundred dollars in to try to get rid of Mickey and my tenants are considering moving,  which I feel in understandable if I cannot get this under control.  They have seen me trying and failing to get this under control for a 2 months now and have been patient, but no one wants to live with vermin.  

At this rate, Mickey may be my most expensive eviction to date.  

Any and all suggestions are appreciated.