What do you use to winterize?

I agree with most all of this stuff. But Deacon for your car isn't a good choice. Mice have to go somewheres to die and inside your seat cushions isn't a good place for them. I do use d-CON in my pole barn though. It is really good stuff to get rid of them.
I agree with DeCon being a bad choice due to the fact that it is intended to ATTRACT mice and such with the intent that once eaten, it will kill them. We defintely want to keep critters away!