KeraTherapy Express Renewal Amino Cleanse Step 1. Amino Cleanse perfectly prepares the hair for the Express Renewal 30 day Keratin Treatment Step 2 This low pH shampoo carefully smoothes the cuticle while simultaneously removing stubborn styling residue allowing for better penetration and absorption of the keratin into the hair fiber. Amino Cleanse is a vital step to maximize the smoothing effect of the Express Renewal Keratin Treatment.