I have just started using my CP soap as shampoo after reading a book recently about how bad detergent (shampoo) was for our hair and hence the need for conditioners and other products.
It refers to the 'stickyness' caused by CP and relates this to damaged folicles in the hair shaft that trap the soap just as cheese would in a cheese grater, and its recommended to disolve the soap in hot water before use, and follow up with a acid rinse.
My hair is really damaged - its super fine, naturally curly, straightened daily and bleached. I usually only use salon products. But I gave it a go. I was pretty impressed. My hair is much more managable, no friz, and no after product needed. Also I usually need to wash my hair every second day (very limp and oily) and four days after washing it's still fine.
When I straightened there was a slight residue, but only on the ends (extra damaged), it wasnt bad, but different, almost like I already had a product in my hair.
I'm going to continue for a couple of weeks and see how my hair feels. I know you can't believe every thing you read, but it seems to be working for me