Shampoo for blondes?

[Deleted]

My natural hair is strawberry blonde and I add brighter blonde highlights to the top. I feel like its getting kind of brassy though by the time I need to go have them done again. Is there a certain shampoo I should use? I have heard about using "purple shampoos", and John Frieda blonde hair care, but I've never had this issue before. Any recs?

[ssmjlm]

I really liked the redken blonde shampoo. I haven't used it in awhile, but I still use the color conditioner 1x a week to keep me from going too brassy.