Whenever I use cones or if I want to clarify, I use Suave Professionals Clarifying shampoo (it's pink) -- I think it does a good job of getting all the gunk out of my hair and giving it a clean slate.
3b/a
Cowash - No Poo
Conditioner - One Condition
Gel - Light Defining Gel

Looking to try Devacurl Decadence line next! Can't wait to try it.