I know I'm supposed to be the gardening expert around here, but eliminating vermin is outside of my area of expertise. Anyway, it looks like a mole has been digging around in my garden bed, and it needs to stop. Any tips on how to get rid of it? I've found multiple websites that suggest diluting a mix of castor oil and dish soap and watering the garden with it. I can't figure out how it's supposed to work, but apparently it does.