A rain repellent is a special product that is designed to be applied on glass. The product leaves a very hydrophobic layer on top of the glass. Water won't be able to form any wetting, and the round beads are more easily blown off the glass.
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Rain-X 620115 2-in-1 Exterior Detailer and Water Repellent, 23 oz. : Automotive
Rain-X 620115 2-in-1 Exterior Detailer and Water Repellent, 23 oz. : Automotive