I used a steam cleaner and scrub brush on my bathroom floor, and the grout
cleaned up beautifully. But it's a private bathroom that's only 7 years
old, so your problem may not respond as well.
At 05:07 AM 2/11/2013, you wrote:
>
>I work in a restaurant that is 20 years old. The grout between the tile
>flooring has turned almost black. The chemical that we are told to use
>does not work. Can anyone tell me how I can restore the grout color short
>acid or high pressure washing? Thanks
>
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