I have absolute confidence in this guy's products:
http://www.predatorpee.com/ About 6-8 years ago I had a family of racoons and a bunch of squirrels doing thousands of $$ in damages to my roof. I sprayed some of his predator urine beneath the roof, and on the trees around the house and they have not been back (I am probably due for another application). He sells multiple types of urine for different pests. There are also handy little hangers for placing around your garden.