I know the answer to this. One of my previous shampoos had a cone in it. I definitely got buildup. It was the D cone. I had to use a non cone shampoo to get that out. I was all CG on my conditioners and stylers so it was def that shampoo. I had to rotate in a no cone sulfate shampoo every third day or my hair would get wonky.
I wish they would stop sneaking that stuff in, ruins a perfectly good product most of the time