OLAPLEX Bond Maintenance Clarifying Shampoo Nº4C 250ml is a deep cleansing shampoo. In this way, this shampoo removes buildup from the hair whether excess oil, hard water minerals, chlorine, heavy metals, pollutants, or product buildup. The accumulation of these can lead to dryness, dullness, or damaged hair. Therefore, it becomes important to weekly, or as necessary, cleanse your hair with a clarifying shampoo. But this shampoo takes care of the hair at the same time as it keeps the hair hydrated.