Did you ever try nature's specialties shampoo? It works great, I even use it for myself. People always come into work and ask what we use because it smells so good and makes the hair softer than soft. Its holistic and kinda expensive $10-25 for a concentrated bottle thats yeilds one gallon of shampoo, but its a great buy. I'll look for it on some websites, its hard to find.

here's some info http://www.naturespecialties.com/
http://www.naturesspecialtiesmfg.com...DirtyDogs.html