We have a polished black granite floor in the lobby of our building. It is very difficult to clean. We have tried numerous cleaners that are made for this surface, but to our disappointment, all of the seem to leave streaks or a film buildup. Is there any substance we can use that can be put on and left to dry without streaks or buildup? We have tried everything we can think of over the past year and nothing seems to be consistent with what we are looking for.
Regards,
Joseph M. Lupia
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