Moth balls worked like a charm for me, a few years back the critters chewed the #1 & #2 coil pack wires on the fusion that I had. Once I put the moth balls under the hood they stayed away
When the Bronco’s leave MAP their left on the passenger front floor, when the dealers perform PDI they just throw them in the trash. When mine was on the train to the dealer I requested that they don’t wash it or clean it out & yes I have it, I did the same when my mustang was on the train 😎