Does anyone know what Yao girls use to wash their hair?

Wash your hair with rice washing water, which stinks, cover your hair for 20 minutes, and then wash it. The bun on the head consists of three hairs, one grows on the head, one is cut off as an adult, and the other falls off when washing and combing the hair. You have to pick up the fallen hairs and store them! Yao girl's hair is tightly wrapped in a headscarf, which can't be seen. The girl's hair looks as if she has been kissed. So, a sister-in-law showed us how to spread her hair, twist three hairs together, and then turn it around and put it on her head, revealing a section in front of her forehead, which is black and shiny and enviable.