I just had a polished marble backsplash installed and it looks great at night with the lights on but during the daylight, I'm seeing lots of hazy, dirty looking marks on the tiles. I asked the backsplash guy about them and he said to just wipe them off, which I did with a microfiber cloth but they sealed it yesterday and it still looks streaky during the day light. Is this just part of the marble look and am I being too picky? Suggestions?