To determine if a windshield wiper is worn, a comprehensive assessment can be made from multiple aspects. Second, conduct a practical test: spray washer fluid on the windshield and activate the wiper. If streaky water marks, hazy residues, or more than four permanent scratches appear, this indicates the rubber blade can no longer maintain proper contact with the glass surface. Abnormal noise is also a critical indicator; if there is a chattering sound or metallic scraping noise during operation, it typically suggests frame deformation or blade misalignment. During regular use, if the wiper requires multiple passes to clear rainwater or leaves persistently uncleaned areas on the glass, this demonstrates reduced elasticity of the rubber blade. Notably, even without visible damage, the rubber material naturally deteriorates due to UV exposure and temperature fluctuations. It is best to replace wiper blades every 12-18 months as routine maintenance, with particular attention before the rainy season. When replacing, choose products that match OEM specifications. After installation, test operational stability across all speed settings to ensure smooth operation without skipping or streaking.
