Subaru 2004 Impreza Owner's Manual page 441

Maintenance and service
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1) Stopper
2. Remove the wiper blade assembly by holding its
pivot area and pushing it in the direction shown by the
arrow while depressing the wiper blade stopper.
11-56
1) Metal support
3. Grasp the locked end of the blade rubber assembly
and pull it firmly until the stoppers on the rubber are
free of the metal support.
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