Years ago I worked with a guy we called "lousy Ted" . Lousy because he never swore and that was the word he used instead and Ted because , well , that was his name. Nice chap but as is common with older guys a bit thin up top. I remember him trying various "remedies" one of which involved burnt boots and another dried cow muck all rubbed into the scalp. Surprise surprise they didn't work.
Also many moons ago I tried ditching any shampoo or other products and just used water and a comb. I'm not one of those people who wash their hair every day so it never felt bad for the first week , perhaps a little riffy the following but in a pretty short time it felt great with that sort of freshly washed silky feel to it. There was no smell or irritation whatsoever . However , a few months into the "experiment" I had a ceiling come down on me and was picking lumps of old lime plaster out of my hair and thought "perhaps I'd better actually use something " and thus proceded to wash it with shampoo. It itched like buggery for a little while straight afterwards.