With Wella Sp Clear Scalp Shampeeling, A Regulating Intensive Anti-Dandruff Treatment, You Can Enjoy Long-Term Freedom From Dandruff. After consistent treatments over a four-week period, it effectively combats persistent dandruff for up to two months. Wella Sp Clear Scalp Shampeeling, a crucial part of the Sp Clear Scalp line, is formulated with the Dermacalm Complex, which effectively but gently removes even the most stubborn dandruff from the hair and scalp while preventing the growth of new dandruff. Guidelines For Use: Three times each week, substitute this for shampoo. Apply a small amount directly onto the scalp of damp hair and gently massage.