Most commercial soaps are made from Tallow (beef fat) or Vegetable oils these days. Only industrial grade soaps (like lava soap, naptha) made to get like car grease off of hands are made with petroleum. Most older folks I know say they've washed their hair when young with either Ivory (tallow based) or castille (olive oil based)
All soaps are made the same way, Lye reacting with fats for saponification
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