- Castile or Aleppo soap
- boiling water
Scrape the soap finely.
Add 1 to 2 tablespoons of boiling water to each tablespoon of grated soap.
Let it stand till the soap is dissolved. Or cook the soap solution if you don’t want to wait so long.
Use the soap solution like ordinary shampoo. -> original 1894 Castile soap shampoo recipe
Alternative: Just use the bar of soap as it is. Wet your hair, and rub the bar of soap over your hair. Or lather the soap between your hands, and rub the lather into the hair.
The soap solution isn’t too watery, so it can be distributed on the scalp. However, as I live in a region with hard water, the combination of soap and hard water made my hair sticky. With the buildup in the hair, the hair looked stringy and worse than before the hair wash. The next time I tried an apple cider vinegar rinse, but the hair still looked and felt waxy. Then I was visiting in a region with soft water and tried the soap hair wash again: This time there was no buildup; the hair was voluminous and shiny. Yay! 😀 The soap has cleaned the hair just like ordinary shampoo. Maybe I’ll gather some rain water the next time I try the soap hair wash. Do you use soap to wash your hair?