We had a toyota dump truck which went into storage every year. Thoes little buggars would get into the heater box and fan. Luckly it was held on by 4 screws, but the rubber gloves really didn't make it any easier.
Get some mouse rat killer and bag it under the hood, then the fabreeze idea is a good one. But it's either cat for the mice or dead mice in the car. Take your pic.