I've found some rancid coconut, palm and cocoa. I'm wondering if I can make these into a laundry bar, and since I don't want any rancidity left make it with a 0% or even -1% (or so) superfat so that I'm assured all of it will become soap. If I do this would it be alright to handle and mix into a laundry soap? I'm on a septic tank so I don't want this to damage my washer or the field or anything. Anyone have any advice?