Blade inspection
Contamination of either the windscreen or the wiper blades with foreign matter can reduce the effectiveness of the windscreen wipers.
Common sources of contamination are insects, tree sap, and hot wax treatments used by some commercial car washes. If the blades are not wiping properly, clean both the window and the blades with a good cleaner or mild detergent, and rinse thoroughly with clean water.
To prevent damage to the wiper blades, arms or other components, do not:
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Use petrol, kerosene, paint thinner, or other solvents on or near them.
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Attempt to move the wipers manually.
Commercial hot waxes applied by automatic car washes have been known to make the windscreen difficult to clean.
Wiper blades are consumable items. Normal wear of the wipers may not be covered by your vehicle warranty.