Shampoo recommendation for grey water

We recently installed grey water in our house that irrigate our garden fruit trees.  We have been using soap nut for laundry and Dr. Bronner’s Pure-Castile Soap for shower soap and shampoo (I also tried Alaffia shampoo).  The shampoo option is very annoying because the mixture leave my hair very oily.  I am looking for some recommendation for grey water safe shampoo choices that wouldn't be so oily.  I read that regular shampoo is diluted enough that it can used for grey water irrigation as long as it doesn't contain the chemical below.  Has anyone used regular shampoo with their grey water irrigation before?  Also if you have a recommendation for a biogradeable shampoo that is good for normal/oil hair, please let me know.

-chlorine or bleach
  -peroxygen
  -sodium perborate
  -sodium trypochlorite
  -boron
  -borax
  -petroleum distillate
  -alkylbenzene
  -“whiteners”
  -“softeners”
  -“enzymatic” components

We have had greywater going to trees for more than 25 years at our school, and have not tried to control the 'products' used by the 25 - 80 teenagers living here at any given time. The willows and poplars are visibly thriving and bigger on the greywater than elsewhere in our campus. We had plenty of running water in the bathing block so it wasn't concentrated: I think that makes a difference.

Art Ludwig's book on greywater systems (really great book) points out that the soil ecosystem is liveliest in the top couple of inches of the soil because it is aerobic. So systems that run on the surface tend to be trouble free and effective, much more so than buried perforated pipes. Our school just has little canals to the willows and poplars.

I found the same with castille soap for hair. If the water is at all hard, it forms a waxy coating on the hair which is just awful! For a while I used a recipe online which suggested using 1 teaspoon of castille soap, 1 teaspoon of coconut milk, and 1/2 teaspoon of bicarbonate of soda, which worked better but still wasn't ideal.

For the past few years I've used a powdered herb - ju-jube leaves (known as sidr in the Middle East), which has natural saponins. Mixed with water to a paste and left on the hair for a few minutes then rinsed off well, it leaves my hair soft, fluffy, and clean, and is 100% natural. It smells a bit "herbal", that's the only issue with it. I'm hoping to get ju-jubes growing on my land and then as well as eating the fuit I can dry my own leaves rather than buying them.

I think a soap nut solution can also be used as shampoo, though I've never tried it.

Check MEN (Mother EWarth News) out, I got a nice formula for clothing soap. The had an article about this site which is where I first about ya'll.

I have been using "Faith In Nature" bar shampoo (and their liquid conditioner) for the last 2 years, while my wife uses Kirk's 3-in-1. Sometimes I use hers on a whim and vice versa. I have fairly dry hair while hers is very oily, and we've been extremely happy with both of these products.

I can't speak to how these would affect your fruit trees, as our grey water only drains to daylight currently, but I believe both products fit your requirements. May be worth a try?