Highlights shampoo and/or conditioner?

I have pink highlights and don't want them to fade.Highlights shampoo and/or conditioner?
I have pink hair also(at the tips), my hair dresser told me that it is going to fade no matter what because my hair is light. I try to only wash my hair every other day, it also helps with damage. And i also use a color shampoo, like Paul Mitchell BrandHighlights shampoo and/or conditioner?
there is usually a shop like walgreens where you can get some shampoo made just for that,i have some.
Get the sunsilk colour lock shampoo
use a shampoo that helps colored hair