My dad lost two sets of sparkplug wires to pack rats [0], circa 2016-2017. I recall him sharing that the auto store staff told him the bioplastics used to insulate the wires tastes like peanuts. He switched to a different brand, and didn't lose another set.
Searching now I found this website about the soy-based wire problem: https://www.howtopreventratsfromeatingcarwires.com/2017/02/1...
[0] https://news.ycombinator.com/item?id=42074028