I don't think sealing grout does much or does it las very long. If you used such small amount of vinegar(or none?), this shouldn't effect the grout. I think you have a grout problem and need to contact the company that installed it. Is there a lot of moisture on your floors?
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"I am a great believer in luck, and I find that the harder I work, the more I have of it." -Thomas Jefferson
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