Abstract: An apparatus for providing automatic back washing for a user is disclosed. The back washer of this invention includes a housing (14) which contains an electrical drive source such as a motor (48), gearing means (52) and a switching means (26). According to a preferred embodiment, insulated extension member (36) is provided for activating the switch (46) while the back washer is in operation. The gearing means (52) drives a detachable mounting member (56) to which there is attached padding and a cover (40) and (62), respectively. In the preferred embodiment, power shaft (54) is driven by gearing means (52) and includes ridges and grooves to provide a spline which in turn cooperates with a sleeve (82). According to the preferred embodiment the apparatus is portable and sets on a bathroom counter.