Why do you think he doesn't wash his hair? Because he hasn't been duped by advertising into using shampoos and conditioners? I have used neither for over 20 years. Shave your head and then when new hair grows, just massage your scalp with warm water in the shower every day and your hair will be far healthier than smearing it with chemical rich soups that simply create a dependence.
I don't like to share. I also have lots of crap. Bar soap is good for some things. But you also need face scrub, loofah, body wash, washcloth, at least 3 different sets of shampoo/conditioner, razor, shaving gel, castille soap liquid, foot pumice, etc. It's good to be single.