This is really nice. The smell will put some people off, but to me it smells sulphur-y and medicine-y, and that makes me believe that it is working. I can't figure out what kind of mud is in this, just from the list of ingredients. I think whatever is in this is broken down into names I cannot understand (or else it is all chemicals, and I have just been fooled into believing that it is mud because of the name!) You are supposed to leave this cleanser on for a minute or two. It feels nice, and very cleansing, yet soothing. Don't be scared off by what it says about the product leaving a 'protective film' on your face; I am extremely film-phobic, and what this leaves behind just really feels normal/moisturized. Great stuff, although pricey. For me, Repechage products are really hit or miss (mostly hit!)