I think an update about the mice in my Fiero will help someone with a similar problem. The short story is, Mickey, Minnie and their kids have vacated the trunk, boot and interior of the Fiero.
I vacuumed the car out getting all the junk the mice had brought in, drove it next to my neighbor's fence (she has three feral cats), put Fresh Cab in the passenger seat, boot and trunk as suggested by a fellow PFFer whose name I can't remember. Six days later, all I smell is Fresh Cab.