Dust mop or vacuum with soft brush attachment.
Damp mop with string mop or Swiffer microfiber using a mild soap, such as a natural stone cleaner, and water .
Residential- dust mop 3 times a week and damp mop with cleaner once a week.
Commercial- dust mop daily and damp mop 3 times a week or as needed.
There is no set time. It's time for a professional polishing when the finish starts to dull or spot.
Anything acidic, such as vinegar, lemon juice, wine, soda, etc.
The only way to remove an etch is to hone it out with an abrasive, such as sand paper or diamond pads, and polish to a shine with a marble polishing compound.
Sealers can prevent the stone from discoloring when wine, soda, coffee or anything with color spills on the surface. It will however still leave an etch (dull spot that doesn't wipe away).