Treat scalp build-up with Neutrogena T/Sal Therapeutic Build-Up Control Scalp Shampoo. After just one use, this dermatologist recommended scalp treatment begins to clear crusty scalp build-up, while relieving itching and flaking associated with severe scalp conditions like scalp psoriasis or seborrheic dermatitis. This therapeutic shampoo even helps control the symptoms of common dandruff, clearing and helping prevent flakes and scalp build-up. The effective formula of this dandruff control shampoo contains 3% salicylic acid, a clinically proven active ingredient, and continues to work for hours even after shampoo is rinsed off. Free of added color, preservatives, and fragrance, the conditioning formula of this anti-dandruff and psoriasis scalp shampoo provides maximum relief for dry, itchy, flaky scalps.