How do you remove grey grout stains on white tile?

[jjonas]

I recently installed white, 1 inch octagonal tile on my bathroom floor and used a grey, sanded grout. Many of the tile now have a light grey stain from the grout. I tried scrubbing with a slightly damp sponge and it removes some of it but otherwise it's very stubborn and won't seem to scrub off. Is there a product I can buy that will remove this residual stain from the grout?

Please help.

Thank you

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[Don H]

most of those octogons i have done are glazed and pretty dense so never really had a time when elbow grease didn't do the job. a vinegar dilution might work for you