Well, the places that I have been are at quarries where the mud is extremely clean (I know...) and feels like silk! It isn't just dirt, it's clay. We hiked for a mile or more to get to these places and it was just awesome! Outdoors, warm sunshine, up to my waist in thick gooey mud. It makes for an awesome massage and if you position yourself just right, you can REALLY have a good time all by yourself!
Cleanup is amazingly easy too! There is always a small pool of water around to wash the bulk off then we carried a gallon of clean water to finish washing off with. You throw on some old clothes to hold you till you get home and shower...no big deal.
Your skin feels SOOOO good afterward. It's like the mud they use in spas only THIS is FREE!