A scalp exfoliation treatment is done 30 min to 1 hour before washing your hair. Proceed as Sarah explains in her lesson to apply the treatment, massage and leave it on your scalp for 30min to 1 hour. Then proceed with your usual shampoo routine. An exfoliating treatment has the specific goal of unclogging your follicles thanks to the chemical exfoliation reaction so it should not be combined with other scalp treatments or it will not have the desired effect. But many exfoliant ingredients have both hydrating and exfoliating properties (like aloe vera) so the treatment on its own can be very complete. If you have the habit of doing an oil mask on your scalp before shampooing, we don't recommend mixing the 2 treatments on the same day.