Give new life to your old wiper blades.

Yeah Brother, makes no diff what make the vehicle is, when the knuckle on the wiper arm is warn, and they all do, it will make the wiper blades jump like that when in use. You're only recourse is to buy new wiper arms for your toy. They won't do that any more, or till the new ones are warn.

Me again. After looking at the blade for 15 minutes or so I did the following. Remove the wiper blade from vehicle (makes it easier to work on). There is a little tab under the blade near the end of the wiper blade arm. Press it and slide/pull the wiper blade toward you. Now when you look at the wiper it seems like its a sealed unit. Check the ends and you will see the rubber is flexibe enough to allow you to slid the "wiper" out ot the blade. You can get the replacement refill (the wiper) or a replacement wiper blade (the whole unit) from the Nissan dealer. Take the refill and slide into the blade assembly. Take your time. You might have to straighten the blade a little so that the refile lines up with the holding tabs in the blade. Looks impossible, but once you've done it you'll be surprised how simple it was to do......****

1. REMOVE RR WIPER BLADE

1. Raise the rear wiper blade to the position as shown in the illustration where the meshing of the claw disengages with a clicking sound. NOTE: Be careful not to break the claw.
2. Pull straight the rear wiper blade to vehicle's left from the wiper arm. NOTE: Do not fold the rear wiper arm with the rear wiper blade removed from it.

1. REMOVE REAR WIPER RUBBER

1. Place the rear wiper with the rear end of the rubber protruded from the blade stopper as shown in the illustration. NOTE: Do not pull out the wiper rubber forcibly, as the backing plates will become deformed or the blade claws will become damaged. HINT: The rubber can be easily pulled out by pushing the middle area of the blade.

1. INSTALL REAR WIPER RUBBER

1. Install the 2 wiper rubber backing plates to the rear wiper rubber. NOTE: Be careful to observe and keep direction of curvature for correct replacement.

b. Insert the rear wiper rubber from the claw of the middle of the rear wiper blade into the rear end position.

c. After passing the rear wiper rubber through the rear end side claw, protrude it from the rear end stopper and pass it through the front tip side claw.

Do you mean the wiper blade or the wiper arm?

The wiper blade should have a small tab or lever on the underside of the hinge where it attaches to the arm. Use a small screwdriver or a pick (etc..) to gently pry the lever upwards to pull the locking tab out of its corresponding hole on the wiper arm. Once the tab is up, firmly grasp the wiper blade and pull towards the base of the wiper arm. Sometimes they stick a little, just be careful not to bend the wiper arm.
If you are looking to remove the wiper arm, remove the plastic cap at the base of the wiper arm to gain access to the nut below. Using either a 13mm (1/2 inch) or 15mm socket (depending on the model) remove the nut by turning counter-clockwise. Once the nut is off, place your hand in the middle portion of the wiper arm and firmly push downward, being careful not to bend the arm. What you are trying to do is rock the arm off of the wiper motor stud. Be sure to mark where the wiper blade rests on the windshield before removing it, so you can reassemble it in the same spot when you put it back together. Use a grease pencil or something else that you can clean off later.
Hope this helps!