As a child we always had to steam our hair with castor oil that mommy got from the produce market and always from someone she knew boiled the oil without salt (she said it made the hair dry) And you think the castor oil we have now is stinky ?!?! that oil was super stinky, smoky and thick like molasses.
and when we went to our paternal grandparents (decendants of indentured servants) my grand aunt always oiled our scalp and hair with coconut oil that she boiled herself. She also kept rainwater in a drum outside to wash hair and sometimes to bathe with.
also remember getting my scalp scrubbed with a grainy oily thing ... and after reading that thread about sugar scrubs, Im thinking it probably was a sugar or sand scrub