L'Oréal Professionnel Efassor Color removal, when hair is in need of a change, whether it is a shade lighter or just a change of tones for the new season, Effasor is a fantastic tool to cleanse. Efassor is a salon quality hair colour cleanser which expertly removes even permanent colour from the hair fibre before a colouring treatment. Uses a gentle powder formula to safely remove permanent, tone on tone and semi-permanent colours.