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Studio Alboretti - Andrea Alboretti-Colman

I too suspect this is a problem with your water. I have encountered this problem before. If you are afraid of using CLR you might want to try Barkeepers Friend. Either the powdered form or they sell a spray called MORE which works well.

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poliphint

Thanks very much for this recommendation, Andrea. I'll definitely give Barkeeper's Friend, actually MORE, a try! I tried hydrogen peroxide over the weekend and it actually did the best job of all the many things I've tried. Hoping it's a safe option for colored grout.

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Studio Alboretti - Andrea Alboretti-Colman

I’m glad the hydrogen peroxide worked for you. Hydrogen peroxide, baking soda, vinegar and/or lemon juice in various combinations are always the best, least expensive option to try first.

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