Fill a bucket with 1 gallon of warm water, and add 1 tbsp. of mild, non-lemon dish soap.
Dip a sponge into the bucket, and wring it out.
Wipe the antique table thoroughly with the sponge, avoiding any delicate metal trim. Rinse the sponge in the bucket as it gets dirty.
Rinse the sponge with clean water, and wipe over the marble-top table to remove any soap residue. Dry the table thoroughly with a towel. If the marble shows minor scratches or etching, consider polishing the table.
Dampen the marble table top with a wet cloth.
Sprinkle a thin, even layer of marble polishing powder onto the marble table top.
Buff the marble table top with a clean, damp cloth until the etching or scratch marks are gone.
Wipe away any debris with a clean, wet cloth. Dry the marble thoroughly with a towel.