Oh gosh, don't use plastic!! Static builds up & the hair gets really icky--frizzy, dry, matted & dull. You can even use dog brushes--we have a nice one. It's called Four Paws Silver Touch # PB560. We got it at our local pet store.

I've even heard you could lightly mist the hair with water prior to brushing, too. For dolls with textured hair, AG now sells a pick for it. I would imagine you could get a metal hair pick anywhere though.