Why is the wiper sound loud?

[AidenRose]

There are three main reasons for loud wiper sounds: 1. Normal break-in noise from new wipers - they still clean effectively and the sound isn't sharp. The blade structure differs between beam-style and conventional wipers. About 90% of beam-style wipers use horizontal multi-layer rubber strips for wiping. When the first layer has already cleared all rainwater, the subsequent layers may scrape against dry glass, creating noise. 2. Incorrect blade alignment - may cause incomplete cleaning during one stroke with sharp noise. This usually indicates an installation angle deviation in the wiper arm, creating an improper contact angle between the rubber and windshield. 3. Blade edge issues - caused by aging or defective products, producing sharp noise with vibration and poor cleaning in both directions. After prolonged use, about 30% of oxidized wiper rubbers develop similar problems.