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I have ceramic tile in a bathroom with dirty grout (probably not sealed correctly) that actually is turning color to a dark grimy brown. I experimented with a dremel tool and grout bit to remove the grout. I can adjust the depth of the grout bit and removed the surface grime just enough to show nice clean grout. Can I stop here and just seal what I've got or do I have to dig out all of the grout and re-grout and seal? What is the approximate depth of grout lines? Thanks!
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