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In extreme cases (like natural slate) a haze remover can be used. So far I have never needed this on any type of glazed or polished stone.
Its tough stuff your trying to remove. And its going to take some time. Urethane grouts are much more difficult to remove then normal Portland types.
Urethane grouts are bugger...lots of elbow grease and the krud cutter....I've used a scotch brite pad for some serious scrubbing.