I was willing to live & let live until they ate my new tonneau cover.  The
most effective preventative that I have found is a product called "Just One
Bite".  It should be available in most feed stores.  It comes in both bars,
which are good for both mice and rats, and a pelleted packet for mice.  I
prefer the bars, because other animals don't eat them.  Put several under
your cars, and toss them along the walls, especially near any small
openings.  Another option is a well fed barn cat, preferably female, or a
feral cat that someone live trapped.  Surprisingly, they hunt better when
they are fed.
Kate
 
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