Apple cider vinegar is probably one of my favorite things to use (As you can see the bottle is almost empty) when I have a ton of build up in my hair or on my scalp. I like it because it gets my hair nice and clean without stripping it.
I only like to use apple cider vinegar about twice a month, depending on how dirty my hair is. If I have a lot of build up from gel or a lot of dandruff from dry scalp, I just go in with my apple cider vinegar mix and spray it on my scalp while I am detangling my hair.
When adding it to my water bottle, I make sure to dilute it with water, adding equal parts apple cider vinegar and water to the bottle, shaking it up a little until its fully mixed.
Because ACV is very acidic, you want to make sure that you are diluting it with water!