How to check if wiper blades are working correctly?

To determine whether the windshield wipers are functioning properly, a systematic inspection can be conducted through the following steps: First, spray windshield washer fluid and activate the wipers, observing whether they operate smoothly without abnormal noise. If there is hesitation or a harsh sound, it may be necessary to adjust the wiper arm tension or replace the rubber blade. If noticeable water streaks, smears, or uncleaned areas remain on the glass, this indicates the rubber blade has deteriorated or become deformed and requires immediate replacement. Further inspect the rubber blade's condition by lightly running your finger along its surface; if you detect hardening, cracking, or jagged wear, this signifies loss of elasticity. If glare appears in the wiped area when headlights are activated at night, this indicates unevenness on the rubber blade's surface. It is advisable to perform a thorough inspection at least monthly, and the washer system and wiping angle should be tested before the rainy season. Typically, wiper blades should be replaced every 12 months or 15,000 kilometres, though the actual interval should be adjusted based on the rubber's deterioration level. These practices will ensure optimal visibility during rainy conditions while prolonging the wipers' service life.