In order to take off the wiper arm, one should switch-on the wiper motor and then off so that the arm can go to its rest. Then loosen and unscrew the nut and washer, then loosen and remove the wiping arm retaining nut cover. lift the blade of the glass and the wiper arm of the motor, and loosen the arm with a large, flat-bladed screwdriver pushing it off the spindle carefully, if required. To refit, make sure the wiper and the spindle are clean and dry and then fit the arm in the correct position. Install the washer and retaining nut, but ensuring that it is screwed into the correct spot with a tightness level as stated and then screw the retaining nut cover back in, ensuring that the cutout on the tailgate arm cover is positioned so that it faces the wiper arm.