I stopped washing my hair with shampoo about 4 years ago. I only do what is called co-washing, which is washing with hair conditioner only, with a silicon-free conditioner (to avoid build-up that would require a cleansing shampoo).
I had to do it as my hair started looking greasy 2 days after a wash.
Result:
Hair looks healthy on dry side, when before it looked really dry (apart from roots looking greasy quickly obv).
Hair grows much longer without breaking
Hair takes much longer before becoming itchy.
I feel my hair is dirty after a week (because of society expectations and pollution, I walk a lot), but it doesn’t look dirty/no greasy roots for at least 3 weeks (it’s the longest I went without washing lately) apart from behind my pony tail as there is more contact/moisture with scalp.
Ways to prevent itchiness:
Most washes start with applying raw apple cider vinegar to scalp (using my cod liver oil syringe ;-D) and leaving for some time. It regularised drandruff issues after several months/years, can’t remember. And if removes any potential greasy area.
Away from washes, I would advise you to try rosemary water, I bought a Weleda lotion that was amazing, before I ever did the cowashing. It stopped the itchiness, the greasiness, for a couple of days and hair looked cleaner. You can do that a few times iirc, before hair looks dirty, and I bet much longer if all you want is to remove itchiness, and you don’t care about looks.
Regular body wash: the French used to use a terry towel glove to wash before showers were in all houses. I wet it, put a drop of organic shower gel on one side and wash smelly areas, turn it around in same movement to rinse, and I’m done. We don’t need to wash everything every day, esp with soap, as it’s bad for skin oil. Euceryn does a nice shower oil actually, if you want to completely avoid any risk of dryness. It’s prob close to hospital wash, but I thought I’d remind the moderate and light cases among us of the option.
Also my shower is: wet hands, put soap on, apply soap, start shower to rinse immediately. Takes me 2 minutes max. I wash my hair separately usually not on same day.
Teeth: milk or cheese apparently protect teeths, so eat some before bed if you can’t brush.