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Calcium Stains On Windscreen / Sunroof

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  • Calcium Stains On Windscreen / Sunroof

    hey guys

    expert advise needed on my issue.
    2 weeks ago, i parked my VW Polo in a covered carpark and 11 hours later i came back to find white deposits on my sunroof running down to my windscreen. Checked up and saw looked like stalactites dripping water on the car. I come from a tropical country and i guess it was ground water run off combined with the concrete.

    The white buildups were hard and i managed to remove them with vinegar.
    But here's the problem.
    There's a water stain that i cant remove. i can only see it when the car is wet and the patches/run off are darker than the rest of the glass.

    I've tried smooth surface clay kit with the utimate quik detailer but it didnt help. purchased the water spot remover and gave it a good scrubbing and it didnt help as well.

    What else can i try?
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