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Won't hurt trying. Are they as a result of a recent wash in the sun or some other source? I have always had luck getting water spots/marks off with Z6. Again, these happen because an area dried too fast or water from some area that dripped. If you don't use Zaino Z6, perhaps another enhancer spray. Good Luck!
Wash and see. If they come back after drying, try washing with vinegar. If they still come back, you'll have to use a polish. Try Menzerna Final Polish.
Um dont water spots just come off with WATER. Water spots are simply substances in "hard" water like magnesium, sodium, ect. They are water soluble, so some water with a lilttle scrubbing should take them right off.