100% natural hair care?? How do you wash your hair??

Hi :)
Could please somebady tell me how do you use the bar soap or anything else for hair?
I used to use Aubrey's shampoo and I like them but I am on anti- allergy diet right now and I can't use/eat coconut, almond, sezame, apple cider and other things so I did try washing my hair with baking soda and now also with the bar soap for 3 times so far... but my hair is not clean at all. I washed it with soap and rinse with citric acid ( I also tried without citric acid ) and my hair is still dirty and very sticky...why is that? What is the "stickness" ? Is it dirt or the soap or what?
Thanks for any idea!! Daniela Tweet