Finding ways to minimize the amount of magnesium or calcium in the water you use to clean the vehicle is key. Deionized water would be your best option for eliminating water spots. Deionized water would also be a the most expensive options as well. Distilled water is a great option as well. Soft or filtered water works better then tap water but can still leave water spots . Whenever possible wash the vehicle in a shaded area and never in direct sunlight if possible.
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