Along with my soap making hobby, I dip into other realms including wine making. I decided to jump in and make sake (rice wine) a couple of years ago. The directions told me to carefully keep the lees (sake kasu) - the "dregs" or waste that settles out of all wine after fermentation. So I have a pint of the sake kasu that has been sitting in my refrigerator for a couple of years while I try to find how to incorporate it into soap for my face and hair. Of course I will superfat with some good oils like argon, but when do I add the sake kasu, I am thinking at trace? Does anyone have any experience with it? Would liquid or solid soap be better?