Odor in the car as a result of Mice

My son’s car has been at my home for the last year, and mice got in it. I have had it detailed, carpets cleaned, and the smell is still there, the mice are gone. I have read about his on the different blogs of car talk, but can find no one to do this work. Any suggestions? I am now afraid of getting the Hanta virus. Help!!

Where were the mice located? Were they in the interior, in the ventilation system, or elsewhere?

The mice themselves may be gone, but it seems as though they have left some trace of themselves behind.