Using a grout saw or an electric tool such as a dremel with an appropriate attachment begin to remove the grout from between the marble tiles.
Remove and replace grout with white marble tile.
This can kick up a lot of grout dust so make sure the area is well ventilated.
In concert with the grout float a large damp sponge can be handy for wiping off any lingering grout haze.
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Etching is corrosion that eats at the marble destroying the shiny polished layer and exposing the more dull marble underneath so you get dull and light discolored spots.
If you attempt to remove a tile while the grout is in place the grout joints will put pressure on the surrounding tiles which may weaken or crack them.
He told me to wash the walls down with 1 part white vinegar and 5 parts warm water before he comes by to remove all the residue of the grout.
As you work be very careful to avoid the edges of the tiles themselves as you do not want to chip or scratch them.
Apply the grout remover to the grout haze on your marble tile.
Scrub it lightly with the sponge to remove the haze.
Let it soak for several minutes as directed by the manufacturer instructions.
Remove all the grout between the tiles.
It is not that hard to repair grout once you un.
Rinse the sponge often and change the rinse water as it becomes cloudy finally allow.