Is it polished Italian Carrara marble? Is it a counter top or tile flooring?

Marble is dissolved by acids like citrus, colas, cleaning products, and even some just plain water. There is no repair. It's permanent. You would have to have a stone professional repolish it. Or accept that patina will happen and continue to happen to marble.

BTW, Carrera is the Porsche. Carrara is the stone. Except much of it sold these days isn't from Carrara. It's from China.

You don't need so many R's. If it's marble from northern Italy it's "Carrara". If it's a Porsche it's "Carrera".

The misspelling of the marble name is so common in the USA that it is sometimes necessary to use it when searching the internet. But why search the internet for something that needs to be bought locally anyway?

If a stone supplier did not make it clear that the Carrara stone was from somewhere other than Italy I would not consider using them again. But I haven't seen non Italian Carrara yet and I have visited a half dozen stone yards in the past year. I was finally successful in persuading my client to use granite.

Joni Hackman:

MB 12 answers your question.

After you get the stone polished again, read up on marble and why it should not be used by people who like to have nice looking counters. They seal the counter with the appropriate sealer and start training the occupants of your house on how to treat your stone.

Or simply start accepting that the stone will get marked up and think of these areas as the first of many to come. If you like the look of the marble in old homes, remember that it is not perfect and shiney and new. Yours won't be, either!

Youre safest bet is to consult a stone polishing expert.

A very hard to "hone" skillset, polishing installed material. Youll be out of youre league and mad you tried