The reciprocating action of this narrow brush allows precision cleaning of large areas, in a fraction of the time of hand scrubbing. Clean into corners, along edges and follow grout lines where rotary brushes struggle to reach. Use with cleaners for additional cleaning power. Always use attachment parallel to the work surface – holding the reciprocating saw with the handle pointing away from the work surface may enable the attachment to become more parallel to the work surface, resulting in better tool operation.