The windshield wiper blade elements should be checked periodically for cracks and deterioration. To begin, lift the wiper blade assembly away from the glass. Next, press the release lever and slide the blade assembly out of the hook at the end of the wiper arm. Use needle-nose pliers to squeeze the two metal prongs at the end of the blade element, then slide the element out of the frame; pliers may be needed for this step. Afterward, slide the new element into the frame, ensuring the prongs snap out behind the last clip of the blade assembly. Finally, installation follows the reverse order of removal.