Buy Hask Placenta Hair & Scalp Treatments - Hask Placenta No-Rinse Instant Hair Repair Treatment for Extremely Damaged Hair 5.0 oz Spray. How-to-Use: For general conditioning: Shake vial well. Apply after shampooing. Massage thoroughly on to hair and scalp. DO NOT RINSE. Allow to penetrate hair for three minutes, then proceed as usual with setting or styling. When bleaching: Apply 1/2 vial to hair after bleaching. Allow three minutes to penetrate hair; then proceed as usual with ton