How To Clean Marble Grout?

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Q: I just bought a house that has beautiful tile in the shower, but the grout is looking dingy and gross. The tiles look like marble to me, but I didn't install them so I am not 100% positive. What is the best way to clean the grout without damaging the marble? I am not opposed to getting in there with a toothbrush! The first photo is how the tile looks when it's clean, outside of the shower, and the second is how it looks inside the shower. Thanks for the advice!!

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Regina is an architect who lives with her husband and children in Lawrence, KS. As a LEED Accredited Professional and longtime contributor to Apartment Therapy and The Kitchn, her focus is on healthy, sustainable living through design.