How do Uighurs make their own soap?

The preparation method of e soil soap is relatively simple. Using the residual sheep tail oil as the main raw material-boiling with fire for three times-shaping with a mold-drying after shaping, fresh soil soap was born. Earth soap does not add any chemical auxiliary materials in the processing process, so it does not hurt hands, so Uighurs use it to wash baby's clothes, so that clothes will not irritate baby's skin. At the same time, soil soap has strong detergency, and it will be very clean when used to wash white shirts in summer. I have pimples and itchy skin. Uighurs will be fine if they wash it with earth soap. This is why this ancient craft has been continued by people 100 years.