Peppermint oil. Had a friend who would migrate down south every winter and year after year would come home and rodents would nest in his car and chew the cables. Cost him big $$$ every year. After trying everything, he literally put Peppermint oil under his car and has yet to have a problem since. Want to say it's been about 8 years or so...
I've persoanlly never tried it, so can't give you my honest opinion, just sharing someone elses in hopes it might help.
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