My mate and I struggle with this a bit. My mother is a domesticated OCD germaphobe neat-freak with violent neurotic tendencies. I had a fucked up greasy nasty early puberty (a common plight these days) when I was about 7 or so, and she'd beat my ass and scream at me if I didn't use all the dandruff shampoos and antibiotic face creams that just made everything worse. That's one of the many thing that prompted me to study herbal medicine and stop taking manmade drugs, aside from a lifelong love of biology and history, when I was 11-12. Problem is I lacked funds for any natural alternatives and stayed a "filthy piece of shit bitch" all through adolescence.
Fast forward about a decade, I'm still a filthy blah blah blah. My mate and I both quit using shampoo a couple months ago, both have long brown hair, I shower maybe 2-3 times a week and he showers once every 2-3 weeks. No soap or shampoo, no natural alternatives, just icky tap water from a steel town through a years-old water filter that he's been showering with his whole life. His hair is much smoother and less greasy than mine (though he needs to eat better and stimulate his scalp more) and he just smells and looks cleaner in general.
Just water doesn't work for me. I've tried various other methods to no avail, and recently decided that baking soda followed by an herbal vinegar rinse is the best method for my personal makeup. I'm not sure what my dear mother will think of that, I haven't seen her but a few times this past month, but I'm sure my mate and I will both still be filthy hoosiers to her. No one else seems to give a damn except his aunt, a Stepford-type childless housewife and cosmetologist (also a germaphobe neat-freak like my mom) who purposefully fucked up his last haircut 3 years ago so she "had" to cut it all off. Then she threatened to do it again a couple summers ago.
How do my mom and his aunt do their hair? They wash it with harsh shampoos and dry it out, blow-dry and flat-iron it every day, "need" petroleum-based conditioners to keep it from breaking like twigs, feel like greasy messes by the next morning, and dye it every couple months."Filthy" or not, I can at least go half a week between my baking soda and vinegar before anyone has shit to say about it. At least my mate and I smell fine without deodorant and perfumes. We do brush our teeth with coconut oil/calcium carbonate toothpaste, and I shave certain areas because I have since I was 10 and the hair grows back like a cactus now. Otherwise frequent brushing and rinsing are extent of our grooming habits.
My point? With our bodies in the lesser state that our artificial selection has granted us, polluted by the many toxins we'll never fully escape in this age, our grooming needs may be complex and differ greatly from each other. My mate, who's mom has bombarded him with even more drugs and procedures since birth than mine has, has the good fortune of an extremely adaptable body compared to me. I want to credit his greater amount of indigenous American blood, but I'm not sure. But you'll never please everyone, some people will die in their ways. What's important is that your level of hygiene supports a healthy body and mind overall.