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I have black/charcoal grey grout on my bathroom floor. Over the years it has turned into a dirty looking lighter grey, and no matter how much I clean it, it still looks grotty. DP thinks it's a build up of limescale (we live in a very hard water area.) I've tried scrubbing it with vinegar & lemon juice, and I've recently got a steam cleaner and used the small brush on that, but it's made no difference. Does anyone have suggestions for how to make it look clean?