Remove the headlamp wiper arm

Fig 1: Removing Headlamp Wiper Arm

Courtesy of VOLVO CARS OF NORTH AMERICA.

Push the cover at the wiper arm mounting to one side.
Slacken off the nut two or three turns to protect the threads on the wiper mechanism shaft.
Remove the wiper arm from wiper arm mechanism: Hold a pipe wrench on the nut and press off the arm.
Remove the nut and washer.
Remove the arm.
Remove the washer hose.