Rain-X 831991L Windscreen Washer Additive. TheRain-X 831991L Windscreen Washer Additive is designed to enhance your vehicle’s windshield cleaning performance with its advanced formula. By adding this additive, you also boost the water-repellent properties of your washer fluid, causing water to bead up and roll off the windshield, which significantly improves visibility during rainy conditions.
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