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Please see the attached photos. I'm not sure what is even in the grout but it appears stained green-brown with mildew maybe? I used an electric power drill grout brush attachment (see picture) with vinegar to no avail. Do I need to go out and buy a dremel?

fireplace

closeup

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Have you tried using comet or bleach ?

  • I have even been able to use a paste made from baking soda and water to scrub things such as built up brake dust and corrosion. – Patrick White Nov 13 '17 at 0:43

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