sells a very nice *garlic barrier* pesticide purely organic from garlic oil/
is effective against lots of small critters as well as birds and
many insects.
esp goo for use in gardens since it leaves no taste on your grown produce.
below is a link to shakeaway natural critter repellents
i believe the one you will want is fox urine.
it comes in a powder crystalized form that is resistant to weather even.. and makes the *pest critter* think that its most feared predator has moved into the area.
so the *critter leaves naturally to a different place.
it is great for attics, along the outside walls of houses..
under crawl spaces etc/
along edges of a garden or esp around plants that you might not want eaten by say : squirrels etc (like tulip bulbs *smile*)