I have used ACV on my hair as well. The only thing I don't like about it is that the smell tends to linger in the hair for quite awhile. If you do use it, don't do it on a day you have to work or have a date!! LOL
My trick is using baking soda and lemon. I take half a lemon, squeeze it into 1 cup of water, and add in 3 table spoons of baking soda. I mix this up and allow it to sit 20 minutes before pouring over my hair. I rub it in and let it sit on my scalp for 10 minutes, then wash as normal.