Review (5/5): Seems to be working!
We have a very great problem with rodents getting under the hood of our cars and tearing up the wiring. We got these 'cakes' of repellent and it seems to be doing a very good job. We also have mouse traps under the hood and after we put the repellent under the hood we haven't caught one in over a couple of weeks whereas before we had one almost every day. And, so far, it is staying in place where we put it with the adhesive. We'll be ordering more.