A guy called called us at MSO Distributing today. He has a USD $9,000 table with a marble top. Apparently the underside of the marble is polished, the top is rough, giving it an interesting look. But the roughness can collect dirt, debris, food, spills, etc.
The furniture is Danish and the maker has recommended using soap flakes for the tabletop and for the natural maple wood. The specific details were not clear.
I'm not sure who the maker of the table is, but this other Danish website gives instructions...
Flint-rolled marble
Before use: Marble is a lime stone and as such must not be exposed to any form of acid. To protect marble from grease and dirt the following procedure is important: The coarse surface is saturated in a thick porridge-like mixture of soap flakes and water. The best result is achieved if the mixture is allowed to seep into the top overnight. Remaining soap is then washed away.
This treatment is repeated 3-4 times the next two weeks.
Daily care: Use water with soap flakes or acid-free wax.
In case of heavy soiling use a bit of scouring powder and a brush. When the top is dry it must once again be saturated with soap flakes. Repeat the latter process 3-4 times the following two weeks.
http://www.kjaerholmproduction.dk/Default.asp?ID=20
While soap flakes is fine for cleaning and will not harm the marble, we are trying to determine how the soap protects the marble and if it attracts dirt. More importantly, how easily does it all wash out?