Best way to UrbanGabru onion shampoo - rinse your hair with water first damp your hair before applying any shampoo dilute your shampoo before application for dilution water to your shampoo and then apply never apply shampoo directly to your hair rub your scalp from forwarding top to backward of the scalp. Rub it with the help of your fingertips massage for at least 3 to 5 minutes before washing.