Endeavour to have the windscreen and rear wiper/blade assembly check for damage, looseness of parts, and cracked or worn blade elements periodically. The windshield wipers may be coated with road grime which affects their ability to clean so they should be cleaned regularly using a mild detergent solution. If the bolts, nuts and fasteners become loose during wiping action they should be checked and tightened as necessary at the same time when inspecting the blades. Broken, damaged or warped wiper arm elements will not effectively clean glass could require changing. For all models of windshield wiper blades and rear wiper blade for 2005 and earlier models; remove the arm assembly from the glass area by lifting it up until it clears push down on release lever then pull out on wiper blade assembly from the end hook of this arm. When you want to take off the holder, press on release lever then draw back in a direction indicated by an arrow on the blade to detach it away from an arm. Join new wiper blade into an arm till there's an audible click.