Aveda Scalp Remedy Dandruff Solution, $28

This spray-on, leave-in treatment contains salicylic acid (yes, the stuff you'd use to treat pimples on your face) to gently get rid of dead skin and other nasty buildup. It also contains clarifying lippia to make sure your scalp is in tip-top, squeaky-clean condition. And, because life is all about balance, it also contains sugar beet extract and rosemary, sage and echinacea to hydrate and soothe the scalp, respectively.