Changing a car's rear wiper depends on the make and model of the vehicle. Some rear wipers are relatively easy to swap out as they feature the same hook-arm connection as the front wiper set. Some vehicles, such as Hondas and Land Rovers, for example, are a little more difficult and involved in terms of replacing the rear wiper blades. These blades will have to be special-ordered through the dealership.
Lift the wiper arm vertically off of the rear window.
Undo the safety tab that locks the blade onto the arm. Releasing this mechanism will depend on the blade's connection type. Some wipers feature tiny levers while others, equipped with a push tab assembly, do not.
Pull the wiper blade off the arm. This will also depend on the type of connection. A small pin wiper can be popped off with a screwdriver. For a common hook arm wiper, it is as simple as pulling the wiper out of the hook at the end of the arm.
Align the new wiper's centre connector with the end of the arm and pull it into place. You should hear a "click" as the safety tab snaps into place, locking the blade to the arm. For a small pin assembly wiper, you will have to push the wiper arm's pin into the side of the blade's centre connection.
Lower the newly installed wiper blade onto the rear windshield.
If the rear wiper involves removing the wiper fluid tube, you may want to consult a mechanic specialising in your brand of car.