[Farmall] Rodents!

[Donald Henderson]

A friend of mine is having a problem with rodents chewing on his tractor wiring in the winter.  I seem to recall that there was a spray of some kind which worked fairly well in preventing this.  Is anyone familiar with such a product or a method to discourage their chewing?  I think my friend has a "John Deere" so maybe the wiring is a product defect????????????  They don't bother his Cub Cadet!  Any help or thoughts would be appreciated.

Thank you
  
Donald Henderson
Sault Sainte Marie, Michigan