Hard water contains minerals like calcium and magnesium. When water evaporates discs, white scale leaves behind minerals. Hard water stains left on car window glass baking in the sun, so it is difficult to remove with regular soap and water only. The acidic properties of vinegar break hard water scale, so it is easier to remove. Microfiber towels provided scrubbing action together with the capabilities of water absorption.

Pull the car in a shady area. Cleaning a car in the sun allows fluid stains baking in the paint and glass.

Fill a spray bottle with one part water and one part white vinegar. Spray the vinegar solution in an area of hard water stains on the glass of the car. Clean wash the vinegar with a microfiber towel. Continue spraying and cleaning hard water stains from the glass.

Fill a bucket with warm water and three jets dish washing detergent. Wash the entire car with soapy water, removing the vinegar solution. Rinse the car with a garden hose. Be sure to remove all soap residue.

Clean the water car with microfiber towels. Ensure that all liquid is removed from the exterior of the car to prevent water stain marks.