Shampoo for bleached hair

Elana

I recently decided to go blonder and I love it. But it looks horrible the day after I wash it. It looks like straw and gets knotted so bad. My hair dresser gave me the purple shampoo but I cant use it every other day and that shampoo was great. No knots, and it was soft. She told me to try Kerastase but the reviews are not that great. Is there another shampoo that I can use to fix this problem?