I've been trying to switch out, but with the summer, it's making my hair feel really greasy, and it's gross. No amount of baking soda of ACV will help.
I found summer the easiest time to transition, b/c I could slick my hair back and wear it up, and no one would know it was greasy rather than gelled back. Gross, I know, but there is a transition period that is really hard. Also, I found the more BS/ACV I used (both quantity and frequency) the worse my hair got. I finally realized that if I just left it alone and used water-only to "shampoo" my hair, the roots are far less greasy than with BS/ACV.
What I would do is clean my hair with a tiny bit of BS just on the roots, rinse with diluted ACV, and then do water-only for a couple of weeks and see how it goes. It can't get too much worse, right? And if your hair is long enough to pull back/up in a pony tail, it won't matter much.
I've found that the key to water-only for me is that you have to scrub your scalp just like you do with shampoo and conditioner, not just wet your hair down. Also, I turn my head upside down while scrubbing and rinsing, to get as much of my scalp/roots clean. Then I rinse in cold water upside down. It gives my hair a lift and keeps the grease from weighing it down too much. (I have wavy hair, YMMV if your hair is straight/thin/fine.)
It has been a few months since I dumped petroleum body care products. I am basically on a twice a week experimental treatment plan. BS does not do a great job for me. I am a fine haired blond mama, so 80% of the ideas for no poo hair care are not meant for me. Tommorrow I will make my own camomile shampoo. Here is my hard to find recipes.
Cool hair info
How long have you been going without shampoo? I'm approaching my third year without, I started in October of '08. It took a few weeks until I was happy with how it looked and even a couple months until I was totally sold on the idea. Now it's shiny and tangle free (my hair is thin, blond and beyond my shoulder blades).
Keep with it and just keep experimenting if you like the idea. My biggest tip is to boil 5 cups of water, then turn off the heat, add 4 Tbs. of baking soda and fill an old Dr. Bronners bottle with that. For some reason heating the water up and dissolving the b/s in that makes a huge difference. If I don't do that my hair is a gross mess. Give that a try. I also rinse with a solution of 50/50 water/acv.