Hard Water Stain Removal from Car Exterior

To remove hard water stains on your car, try rinsing your car with white vinegar, using a solution of 3 parts soft water to 1 part white vinegar, increasing the vinegar content as needed. Be careful to only wash your car in the shade, or in the evening, as the sun will dry the water quickly and cause more spots. You may also want to try using crumpled newspaper for polishing your car, as it will leave a nice shine and prevent spots. You may want to treat your car with a commercial product, such as Rain-X to stop the stains from returning.