To remove a wiper blade, first lift the arm away from the windscreen and turn the wiper blade horizontal. Lift the small spring clip, then slide the blade centre block down the arm, and withdraw the blade over the end of the arm. When refitting the blade, ensure that the spring clip engages correctly. To remove an arm, prise off the cover and unscrew the spindle nut, then remove the washer and ease the arm from the spindle by rocking it slowly from side to side. If the wipers are not in their parked position, switch on the ignition and allow the motor to automatically 'park'. Refitting is a reversal of removal, but before tightening the spindle nuts, position the wiper blades according to model.