Periodically the windshield wiper and blade assembly must be examined to identify any damage, loose parts, and cracked or frayed components on the blade assembly. The road film can accumulate around the wiper blades and it might limit its effectiveness, so these blades must be washed by using a small amount of detergent solution. The wiping mechanism may loosen bolts, nuts and other fasteners which must be checked and tightened where needed when the wiper blades are inspected. When the wiper blade elements are broken, damaged, or deformed or can no longer clean appropriately then it must be substituted by others. To remove the wiper blade assembly, raise the arm assembly off the glass first, lift the release lever and pull wiper blade assembly out of the hook at the end of the arm. Then fit the new wiper to the arm with a corresponding clicking sound.