Rainwater can damage a car's paint job by leaving behind mineral deposits and pollutants that can cause water spots and discoloration. If left untreated, these contaminants can build up and become harder to remove over time. To prevent further damage, it's important to regularly wash your car after it's been exposed to rain and consider using a protective coating or wax that can help shield your vehicle from the harmful effects of acid rain and other pollutants. Click to Learn more.