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Repellents. Currently, there are several mole repellents on the market. These repellents are based on castor oil. Some success has been reported with these products, but no scientific research has shown a consistent result."
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Home Remedies. Many home remedy approaches have been tried over the years to combat the mole. Desperate homeowners and gardeners have tried placing various materials irritating to moles in the runways, such as broken glass, razor blades, rose branches, bleach, moth balls, lye, and even human hair. Some gardeners believe chewing gum kills moles via intestinal blockage. Some have hooked up their cars exhaust system to mole tunnels; others have wastefully pumped hundreds of gallons of water into the tunnels. Frightening devices such as mole wheels (spinning daises), vibrating windmills, and whistling bottles have also been tried. In general, these home remedies have no value in mole control.
More-over, some can be hazardous to human health, companion animals, and wildlife, or detrimental to the environment."
above excerpts from:
http://www.agcom.purdue.edu/AgCom/Pubs/pdflinks/ADM-10.html
I'll just trust the guys who do the research on moles. In my experience their advice is much better than old wives tales and urban legends.