A blanket washing apparatus for washing printing blankets of various circumferences on a blanket cylinder in a variable cutoff printing press is provided. The blanket washing apparatus includes a washer head, a movable bracket coupled to an axial end of the washer head, the movable bracket including a slidable portion to vary a position of the washer head based on the circumference of the printing blanket on the blanket cylinder. The blanket washing apparatus also includes a guide plate for guiding the movable bracket to maintain a prescribed gap between the washer head and the printing blanket on the blanket cylinder as the slidable portion of the movable bracket slides. A variable cutoff printing press and a method of adjusting a position of a blanket washing apparatus during a cutoff change in a printing unit of a printing press are also provided.