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It seems a bit of excess cement or grout have mixed with water and stained my bathroom tiles. Tried soaking it / rubbing it with cleaning vinegar but to no avail.
Use a commercial grout cleaning product or a 50/50 mixture of white vinegar and water. Spray the solution and let it sit for a few minutes then scrub with a sponge or brush. Repeat until the stains are removed. It may take multiple tries.
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