For what its worth, look into the use of apple cider vinegar (ACV) as a way to wash your hair, scalp and skin.
Supposedly, it will clean, disinfect and leave things better than it found them.
However, its an acid, so take it slow and dilute to an appropriate strength if you have sensitive skin.
In the ‘6o’s, my grandmother used to rinse our hair with apple cider vinegar diluted with water.