A tip if you (store or park you Mustang inside a garage) I store My Mustang for the Winter and Mice look for places to build nest that are WARM, so if you park your car inside and it's still warm they'll go right for the motor and under the hood.
Befor I store my
Stang I let it cool off, then pull it inside. Then I put about 200 Dryer Sheets under it because the mice hate the smell and dont go near it, scatter the sheets all under the car so they cover the whole area. Then put a bunch of Mice Traps around to catch any of them that may be near. I never have had a mouse go in my car.
Best of luck!
Ron