rodent proofing a garage

http://www.forabodiesonly.com/mopar/showthread.php?t=196253&highlight=marmots

My rodent thread.

I have had mice in many vehicles on our farm, they can get into any ventillation duct on a late model car. Shake Away works in cars for 3 months at a pop. Excluding a 100% air tight sealed building you will likely not physically prevent them from coming in. The best thing is to deter them from wanting to be in there by aromatic chemicals or sounds.

Ive tried a number of chemicals and repellents. A large number of moth balls everywhere work decent. I have had cats which worked for outside pretty well but they were spraying in my shop so I started locking them out.

Best thing so far in my shop is to leave a radio on fairly loud mounted to a wall so the speakers produce some acoustic action into the walls. Keeps mice gone from the whole area inside and outside of the shop.