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Title: Works Well...Much Elbow Grease Required
Review: The product does remove hard water spots; even those that have remained on the glass for long durations. One must find a balance with the water and powder mix, expect to scrub and work hard to remove the spots, and severely spotted glass will take at least two applications and one to two hours to complete (by hand). In my experience, the best results occured when minimal water drops were used to obtain a thick pasty appearance with enough grit (during application scrubbing process) to remove the spots. The automotive glass cleaned with the product was severely hard-water spotted for about nine to eleven months. I would have rated the product five stars if it had worked with less scrubbing intensity or less time. Spot-X removed spots that normal glass cleaners and glass clay bars could not. The cost and time investment are less than the other alternatives: glass polishing, professional detailer, or glass replacement.
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