So my daughters love their American Girl dolls. My youngest especially loves Elizabeth Cole's hair. Sadly that means that it's not tied back like I would prefer so it gets tangled very easily.
You'll need: a spray bottle with water and the American girl brush (maybe once every other month I like to spray their hair with a little leave in conditioner. (any spray version will do-be sure to only do this once in a while.)
Spray doll while upside down. This makes it so that you do not get the body wet.
Check out a few hairstyle ideas here:
AG Hair styles