Specific shampoo for the application of the Argan Keratin Straightening Liquid straightening treatment. Helps cleanse hair of debris and prepare it for post-keratin treatment. It is recommended to wash the hair 2 times with the Argan Keratin Cleansing Shampoo. Leave 5 minutes of exposure in each application. Once the hair is washed, dry completely between 80 to 100% with the dryer or in the air. The hair will be prepared for the application of the Argan Keratin Straightening Liquid treatment.