Typically etching is not removable. You may be able to pay a floor tile restorer to polish/grind down the tiles.

Thanks for thr reply, millworkman. I was afraid they wouldnt be repairable. I guess it’s time to contact a professional about replacing or grinding down the tile.

Call a stone restorationist to polish them out. Those are very scratched. They are also etched, from contact with acids, like most standard bath cleaners. You need to use only a pH neutral stone cleaner on marble.

They are restorable by a reputable refinisher. Not a DIY project, but less than replacement.