It's been a while since I worked as a shampoo girl in a salon, so things might be different now...But it used to be that you don't shampoo your hair after a perm for 2 days. When perms are done, they just rinse off the solution and then use conditioner on it. But you shouldn't wash it for the 2 days. If you had it colored, it's okay to wash it the next day. They shampoo it 2 times after the color is done processing, and it's fine. But I recommend you use a shampoo suited for color treated hair.