How to remove stains from unsealed sanded grout?

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    John Brown
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    Our countertop has sanded, unsealed grout that is stained and discolored. We need to get everything back in color so we can get it sealed.

    We’ve tried White Vinegar, SoftScrub and Oxygen Foam Bath Cleaner, but nothing seems to work. Home Depost suggested that we use an acid wash but that it could damage the tiles and we really do not want to take that risk.
    A quick search on Google seems to indicate the use of an oxygen bleach in powder form. We need wise advice from anyone who has to deal with this situation?

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