happy dreadiversary koru!
phishcarrie - How old are your dreads? That can make a big difference on what to use. A deep clean with ACV is supposed to work wonders. Just google ACV and dreads and I am sure some stuff will come up. Tea Tree oil can also work wonders for itchy scalp.
One other suggestion which I know works is Neutrogena T-Gel. It doesn't leave a residue and I think it actually helped with the knotting process for me. After I use it my dreads knot up a lot and I usually have to go in and do some separation of some dreads. It feels great and takes care of the dandruff. I alternate between the T-gel and Dr. Bonners with Tea Tree oil. Hope that helps.