They also regularly check the windshield wiper and blade assembly for damages, misalignment of its parts, and cracking of or wear on the blade. Dust can accumulate at the wiper blades and reduce their effectiveness, thus, they should be cleaned with warm water and mild soap. The wiping mechanism would rub the innershaft and the fasteners thus must be checked and tightened should it be necessary when checking on the wiper blades. If the wiper blade elements are cracked, worn, warped or that the wiper blade no longer cleans sufficiently then these must be replaced with new ones. To remove the wiper blade assembly, raise the arm assembly off the glass, push down on the tab and insert the blade assembly until it is out of the catch located at the end of the arm. Cut the end of the blade element and then use a needle-nose pliers in squashing it and removing it as well as discarding it by replacing it with a new element and set the fingers of the blade assembly in the notches of the wiper element. Removal is the opposite to Installation.