Well, I thought I'd report back: I used Pure Ayre Pet Deodorizer with works "using natural enzymes". I sprayed the entire surface, and 360 degrees around up inside where mice have eaten through (3 locations). The smell is 80%+ better, and it did not stain the black headliner. I can stand to drive it now and you are not hit with the stench when entering the garage anymore.
I figure I'll give it another round pf Pure Ayre in a week or so, add some type of coffee or other absorber, a green tree deodorizer of course.... and that will get me by. I appriciate all the suggestions.