I stopped using shampoo (and almost all personal care products) in 2007. I read a ton on the long hair forum at the time, and here's what I remember of what I learned:
- Your hair, like all mammals, has natural oils that help to keep it from getting soaked in a light rain, clean itself with little help from you, and other wonderful features.
- If you simply run your fingers through your hair daily to get out the tangles, it is entirely self-maintaining. Some people (like me) need to "preen" daily, too - run the oils from the scalp to the ends after a very brief scalp massage. You can do this with fingers or a boar's bristle hair brush.
- If you don't run your fingers through your hair daily, and it's long, you will get natural dreadlocks.

- During the hygiene obsession following Pasteur's discovery of bacteria, people started washing their hair regularly. This is what shampoo does - it washes out all your natural oils. What you think is "dirty" on day 2 or 3 after a shampoo is actually your natural oils overproducing to try to get spread out throughout your hair again. (This also happens with your pets. That's why your dog stinks when it gets wet. Mine doesn't. :P My cat looks like it just came from the groomer's bath every day, thanks to a combination of good diet & no washing by humans, ever.)
- Since the shampoo rinses out all your oils, your hair becomes limp, flyaway, more tangly, and suddenly, you need "Volume & Body" shampoos, and most definitely, conditioner.
- When you stop using shampoo, there will be a transition period when your scalp is still overproducing oils, then it realizes it doesn't need to do this and slows up. It helps to wear hats, wear your hair up, or be on vacation during this time. The length varies individually from a few days to a few weeks. My short-haired hubby was the former. I'm the latter.
So I just went cold turkey. I did it at the beginning of summer when I knew I'd be wearing my hair up nearly every day, and it took several weeks. I made a ton of oil, and had to massage it and de-tangle it daily, but it was still less time than taking a shower every 1-2 days, and the ridiculous 30 minutes of blow-drying I had to do (I had THICK hair) if I didn't want the two-hour air dry time.
A few months later, I convinced dh to do it while we were on vacation. He has short hair an is an attorney at a major law firm. He can't look like a greasy hippie. His transition lasted about two days, and then he discovered that he didn't get hat hair anymore and he was totally sold. He no longer needs tons of styling products, either (he used to use hair spray & gel). He just uses a tiny bit of coconut oil and gets the same style he always did.
Benefits for me:
- Volume out the wazoo. My hair is never limp anymore.
- 3 minutes a day, max, to brush & massage. If I ignore it for a few days, it's fine, too
- Camping is a breeze
- Water bill way down
- My hair now has a natural wave to it! It was board-straight my entire life!
- No more dents from hair implements, pony tail holders, etc.
- Air-dries in 30-minutes now
- Not nearly as heavy (water-logged) when I get out of the water now
- Very rarely ever "fly-away" anymore.
- My hair cleans itself. I was in my sister's wedding and the stylist plastered my hair with hairspray. I expected I'd have to wash it, but instead, the next morning, all the spray was gone. Ditto for when I went to karaoke at a very smoky bar. You know how smoke stays in your hair for days if you don't wash it. Well, the next morning, it was *gone*. My clothes still stank, but my hair did not.
Downsides for me:
- When I go in chlorine, it seizes up and feels like a wax factory. I *have* to wash it then if I don't want it nappy for a week.
- I have to preen daily. DH does not. If I don't, after about a week, the back of my crown gets greasy and starts spreading around.
- Doesn't have that "Breck girl" shine that shampoo used to give me
I have bad hair days every now and then, just like I used to. More rare now.
If I neglect preening, or hit chlorine, I just do a baking soda & vinegar wash. 1T bkg soda in warm water, wash with that. 1T apple cider vinegar in warm water, rinse with that. Done. I do find that the more often I do the BS/ACV wash, the more often I have to do it.
I don't even use water. I only take a shower once every other week or so, and don't take baths unless they're ice baths.

I do not stink. I have friends & family who wouldn't hesitate to tell me if I did, and I ask. I don't. I don't use soap unless I'm "showing or smelling". Like your hair, your skin makes oils that do the cleaning for you. Even water is usually unnecessary once your body gets back into "clean itself & don't overproduce" mode, and when dirty, water alone is usually enough. Soap is a last resort.
I don't use lotion. First I transitioned to olive oil; then I decided to work on my skin from the inside out through nutrition, and now I don't need anything, after a lifetime of dry skin, and eczema for dh.
I don't use commercial deodorant & certainly not anti-perspirant. When my diet's spot-on and I'm not detoxing, my sweat does not stink at all, just like the stories I used to hear about farmers. But when there's anything to worry about, I use my mix of 50:50 coconut oil & baking soda in the morning, and I never, ever stink.
My skin glows and is softer than ever.
I know it makes me a hippie, but at least I'm not a smelly, greasy hippie.
There is NOTHING like being able to take off into the woods for a week and not worry about personal care products, or stinking as a result of a lack of it.