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How do I clean joints that have turned gray?

Some grout joints between tiles are still gray even after a year, even though the grout was brown. Of course, we did a lot of wet cleaning and also tried a grout cleaner. But that only resulted in contaminating a few tiles, not really getting the grout "clean".

Does anyone have any advice on grouting the joints or how to put the tiles back in place, otherwise I will have to clean 2 or 3 again?

• tiles
• grout joints