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You'll test a small patch first if it works keep going if it doesn't STOP
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A razor blade makes removing hard remnants EASY
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Chunks of SHYN paste on a steel scrub with firm pressure will do the trick, but you know what I'd try now, applying vinegar onto the glass and glad wrapping it over night and see if it wipes off in the morning.
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When using SHYN paste make sure you rinse the product completely off then wipe the glass dry with your SHYN ultimate
