Remember the commercial “It softens your hands while you’re doing dishes”? Well, I believe that it does the same for the hoof. I have used this household product for more than two decades for soaking horses feet when there was an abscess or a bruise/inflammation. I always had good results; the foot never got damaged like in the case of Epsom Salt. I just add about the same amount of this dish washing liquid in the water as when washing dishes. After soaking (15 to 20 min/warm water) I rinse the soap off and do what ever I have to do with the hoof thereafter. 

All my comments are merely my opinions and beliefs gained from 40 years of professional life with horses. All drugs should be used only by the consent of a veterinarian and according to his instructions. A person who is with the horse everyday, should know him better than anyone else.