I co-wash with Suave Keratin conditioner. I also co-wash my 3 year old's hair with the Suave. Yes, it works even though they put dirt and sand in their hair. The conditioner still manages to clean, and stuff like that will rinse out with the conditioner.
I can't use it anymore - since I moved, something about my water doesn't mesh well with the co-washing technique. I'm sad, because my hair looked awesome before we moved!