I hadn't colored my hair for about 10 years at this point, so I wasn't doing anything besides washing and
conditioning with the same shampoo I have used since high
school. After I used Dawn I realized that my good old shampoo wasn't the problem, and went back to my favorite shampoo.
This time it has been back on and off for a few weeks, so I did this today: Reg shampoo, Listerine: the minty kind! (and let set for about 5 min), Dawn, Reg shampoo, Conditioner.