This is less about the cleanliness of hair and more about the color. Purple shampoo is the ultimate antidote to brassy hair, giving dull, blonde locks a quick refresh. However, blondes don't need to use a violet-tinted formula every time they shampoo. Instead, it should be used only when orange or yellow tones start to appear. (An everyday shampoo can be used the rest of the time!) Depending on the blonde you’re working with, this could mean using purple shampoo once per week or even once per month. Whatever the case, we recommend INVIGO Blonde Recharge Cool Blonde Shampoo. It should be massaged into wet hair, left on for three to five minutes, then rinsed out thoroughly for best, brass-busting results.
