Originally Posted by ghrocketman

To repel moles best with Castor oil, it needs to be mixed 75% Castor oil with 25% Dawn dish soap. The soap allows the oil to penetrate deep into the soil, driving the moles out of your yard into the neighbors. Spray the mixture out of an Ortho weed-b-gon or similar hose end sprayer. Depending on the sprayer you may have to thin it with about 25% isopropanol.