Spray peppermint oil all around, plug all small entrances with steel wool, and get an army of barn cats & enough food to feed them 3 times a week (you want them sticking around, else they'll just take off once the mice dry up).
Yep just ordered some pure peppermint oil and am gonna soak cotton balls with it for the engine bay. I have bobcats hanging around maybe I'll put out some tuna.
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