renew bathroom floor tile?

Unglazed ceramic tile
does not get clean with a mop
Found one guy who will put on a chemical that takes the stains out, it was an unmarked bottle though so i don’t know what chemical. Then i found this sealer to put on after: http://www.stonecare.com/Shopping/ProductInfo.aspx?ProductID=7834

Someone else recommended to find someone to grind it down slightly.

Anyone have any thoughts, advice, or recomendation of someone to fix it?

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