Last time I went to my hairdresser, I took my shampoo bar with me. I also took her a couple and brought my own conditioner. She was happy to use my 'poo bar on me, and though sceptical, she took the 'poo bars. I have not followed up with her to see if she tried them or not. I did tell her she could use them as a super conditioning bar soap if she did not want to try them on her hair.It takes a few days for your scalp to adjust from commercial shampoo to a shampoo bar. Check out the active thread on shampoo bars for a great recipe by Genny. I know when I go to my hairdresser for a cut it takes me a few washes to get my hair looking good again because I don't put up a fight to let her wash my hair.