Many good suggestions here on the circus mouse problem (yes, this is a Tech Help Area but ya gotta have a sense of humor too) Would it be considered inhumane to hang fly-paper on the rear view mirror to nab an uninvited passenger? Yall know just how aggravating a rogue fly can be, windows down it hides, up, here comes the dive bomber.....LOL

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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)