Windshield wiper blades should be inspected for wear and cracking. See "Wiper Blade Check" in At Least Twice a Year for more information.
To replace your windshield wiper blade inserts, do the following:
Make sure the tabs are locked into position. See Maintenance Replacement Parts for the proper type of replacement blade.
If your vehicle is equipped with a rear window wiper blade, follow the procedure above to replace the wiper blade.