I think it mostly depends on your hair whether or not it is damaging to wash it everyday.  I choose not to wash everyday, and could go a week or close to it when I was using shampoo.  If I washed my hair everyday my hair would always be wet, I'd almost never braid it (because of it being wet or damp), and it is just too drying to my scalp and length to wash that often. 

CO is the term for condition-only washing.  I'm working on switching over to this, and what it means is that I wash only with conditioner, no shampoo.   I use suave daily clarifying, and so far it is cleaning just as good as shampoo, but leaving my length soft and less dry.  I do have to wash every 3 days now.   I've tried to get to a pure CO routine several times over the last couple years, and after a while I seem to get too greasy and have to go back to some kind of shampoo washing.  I've only switched over for a few weeks this time, so I don't know if the good results will last. 

COW-C is a term and washing system that Anais came up with that works quite well for many people also.  I'm not sure how to post the link to her instructions, but basically you condition your length with a light conditioner, then mix conditioner, water, and a little bit of shampoo in a bottle and use that wash your scalp.  Once you rinse all of that out, condition your length again with a heavier conditioner.  I used this method to transition to CO washing, and will definetly go back to it if this doesn't work out for me.

I have to wash my scalp-hair every day or else it is greasy the next day, and also my head gets this "cold" feeling because the dampness of the oil on my scalp. 

That said, here's my routine:

I have tailbone length hair, and I put it in a high ponytail and cover that with a plastic bread-bag, clinching with a sturdy long barrette. You could tie it too, I guess, but a metal barette works good.  I mix a dimesized amount of shampoo and some water in an old shampoo bottle (a clear one helps)  and I wash my scalp hair only, every day.  My length doesn't need it--I could go up to two weeks without wetting it in the shower.  But NOT my head!!!  When I DO do a total wash, I precondition with lots of coconut oil, and condition with a heavy conditioner.

If you are interested:
To do the scalp wash, you must hold the bagged ponytail up above your head while using your other hand to massage in the shampoo and rinse, etc.  When finished, your head feels nice and clean.  My length remains fine through all of this.  It took me a year to find a hairwashing method that worked!!! Well, that's my hair washing story and routine!   

Until a few months ago I was washing my hair every other day (except for a short period when it was every day) and doing the regular shampoo-condition routine. This past summer I started to space the number of shampoos and now I usually wash my hair every 3 to 4 days using a CWC method with diluted shampoo. But because my length was bleached last year, I almost always use a conditioner on a daily basis. Rinsing off the conditioner helps to get rid of some of the sweat that accumulated during the day.

The adjustment period can be kind of gross, but if you try to increase the days between washes and don't like it, you can always go back to your usual washing schedule.

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I used to wash my hair everyday, because I used to shower every day.  I showered every day because I have severe eczema - a skin condition where my skin is itchy, dry, and flaky all the time.  I really didn't pay attention to my hair, since how my skin felt was more important.

Since then, I've been on a treatment that has lessened my eczema symptoms.  I can skip a day of showering now.  I started to pay attention to how this effected my hair, and it didn't really make a difference. 

If I skip two days, my hair just feels coated and gross, which makes me itch more.  So I've determined that the I can only skip one day.

I think it's partly a personal preference, because some people do better with the natural oils in their hair, especially if it's wavy. 

Cynde

I wash my hair once a week, generally, though I have been known to go two weeks before.  I just don't find it really necessary to wash any more often than that.  It usually takes my hair about 12 hours to dry (sometimes longer).  Also, it takes 2 or 3 days to start getting manageable again.  The longer it's been since I've washed it (inside that week timeframe), the easier it is to put up in various hairstyles.  Plus, I'm cheap.   I bought some shampoo & conditioner that were each $9 for an 8 oz bottle, and it lasted for about 4 months.

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I'm with bio_muse here.  Although I wash about every 5-7 days.  I find it much easier to put my hair up several days after the last wash, the first 1-2 days are always a struggle
Everybody's hair is different.  I found even with short hair washing every day was too much for my hair, and the longer it gets the longer between washes.

Hi Sasha, I am right on board with you when it comes to hairwashing.  I shower every day, therefore, I wash my hair every day.  It is definetly a hygiene thing for me, too- I've really got this issue with always looking, being and smelling clean.  If you were to check my purse, I'm the girl who's always got an extra deodorant, perfume, body cleansing wipes, and anti-bacterial junk- yup, that's me!  The way my body is right now, if I don't wash every day I become very greasy and yucky looking, usually by the morning of the next day, so every morning I shower and wash my hair.  However, since joining the boards, I have learned that I can just wash my scalp without terrorizing the rest of my length, and it REALLY seems to be working well.  I don't bag my hair, because it only about BSL length and I don't have the drying-time issue as some of the others do, but I do just lather my head and let the diluted shampoo rinse down the rest of the hair, then I condition the bottom half only.  So, I completely understand your issue here!  I also just tried a vinegar rinse for the first time (only once, so far), and really liked the results.  I think I will make this part of my routine once a week from now on.  As for CO, I have not tried this, I am afraid of my hair being too greasy with this method- so no input there.  There's gotta be hope for us!