Suggestions for Rehabbing Marble Tile Floor?

I'm on my second temporary residence here in Saudi while my permanent quarters are getting painted and fumigated, and this house (like all the houses I've seen here so far) has some great features and some interesting quirks. The best part of this house is the marble tile floor that runs throughout; unfortunately, that is also the element that seems to have taken the most knocks over the years.

Though I'll be moving out in a few weeks, another of my colleagues will be moving in so we are looking for advice on restoring these floors to their original condition.

As you can see from the pictures above, there are several places where the floors are stained, and of course we have no idea how old the stains are or what caused them. In some areas the browning is small and localized, in others it seems lighter but more widespread. What you can't see in the pictures are the myriad of scratches caused (I imagine) by years of careless furniture moving and just general wear and tear.

The questions now are what can be done to lighten or remove the stains, what (if anything) can be done to remove the scratches, and how can we protect the floor from further abuse in the years to come? Our housing here has been neglected for a number of years because of frequent employee turnover, but we are now focused on rehab efforts to restore the homes to their former glory, so any assistance from savvy Apartment Therapy readers would be greatly appreciated!

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