I've been using Dreft for the past 3 pruning seasons now, mainly on the Cabernet sauvignon vines, as sometimes I have to remove sizeable sections of old growth. These large pruning wounds are often horizontal - the perfect surface for some disagreeable, airborne pathogen to settle upon. It's a relatively inexpensive solution to a potential vineyard dilemma and any soap that is left over I use to wash my smalls.
Dreft: recommended by pediatricians...and a certain professor of viticulture. Of course, I'm not supposed to tell you that.