Probably ebay..

Most items are really harsh on marble, and remove the finish, but not the stain. The BEST way to have a beautiful table it to take the top to a marble/granite fabricator and have them re-finish the top. They will buff it and re-seal it. Gorgeous!

You have to be really careful with marble because it stains and etches easily.

Just use dish soap.

If it is stained you have to use a product designed for marble, which you would get from a company that sells marble counter tops.

Once you get it clean it is a good idea to seal it.

looks like a black mastic was on them inside all pcs have corners cut on a 45 degree

I assume it is a single piece rectangular or square marble table top. The marble slab is an inlaid on black mastic with the corners cut at.
45 degree.Be careful to remove the marble top from its stand or legs.
Measure and cut a similar size and shape base of half-inch thick plywood or solid base of your choice.Remove the existing marble top by working on both sides to disintegrate the base mastic. Scrape away all old mastic or glue. Applied new mastic or bonding sealant onto the new base letting it to become tacky. Place the marble top on the new base and adjust by knocking on the side carefully to make neatly aligned . Press on the marble top or placed some flat objects to
exert pressure for a good bonding. Add by gluing edging or trimming piece to cover the rim if necessary.
However,if your marble table is marble pieces inlaid on mastics or terrazzo ; it is harder to do likewise as damages is imminent by removing the marble pieces. It can still be done by this method with care . Use in-situ terrazzo pack as the binding of marble pieces.

if you are from India

Than just use EASYOFF BANG its good and very helpful

don’t do it. the best option is two part epoxy. second best is a light scuff sanding, an alcohol primer and an oil base floor paint. ultimate advice…. just leave it unless the paint job is temporary

Marble that has lost it’s shine can be livened up by a commercial marble cleaner and polish.

Tin oxide (putty powder) can be used to polished ethced or dulled surfaces. You rub this on with a damp cloth, folding and refolding to clean the damp areas.

Then use an electric polisher to buff the surface.

To remove the coffee cup stains:

Use a napkin, blotter, paper towel or facial tissue to make a poultice. Dampen with 20% peroxide (which is hair bleaching strength) and a few drops of ammonia.

Leave the poultice on the stain for a long period (approximately 24 hours or longer if needed). You can use plastic wrap to cover it to keep it damp.

You may need to repeat the process if the first poultice does not finish the job.

Hope this helps!

The splash marks have left dull marks on an otherwise highly polished surface!

The acetic acid has etched the marble. Polish it using Brasso (a mildly abrasive metal polish) or a neutral car paint restorer.

SHORTER VIDEO VERSION OF HAND MADE MARBLE PING PONG TABLE BY SCULPTOR NEAL BARAB WORKING OUT OF PIETRASANTA, ITALY. THIS IS THE FIRST OF A SERIES OF 10 UNIQUE MARBLE PP TABLES, THE NEXT UNVEILING IN SUMMER 2009 AT HOTEL BYRON, IN FORTE DEI MARMI, ITALY.

Duration : 0:0:14

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Use a specialist cleaner, like Hagesan Marble Stripper to get the crud off first, then use Top Protector to protect & shine it.