An auto cleansing apparatus comprises: a drive unit which is equipped in a case and generates the rotation power； a pair of cams which may be rotated in accordance with the rotation power of the drive unit and wherein the positions of the cam sides may be changed by turns； a rotor link which is provided with a pair of the rotor arms to be contacted with the cam sides and which is rotated in the case to and fro while the rotor center shaft is rotated and the rotor arms may be moved forwardly and backwardly when the cam sides of the cams are changed by turns； and a rotor plate which has cleansing member equipped in one side and which is connected to the rotor link.
