How do I prevent staining on Natural Stone?
Most stones are porous and readily absorb liquids and moisture. Materials like limestone and sandstone are extremely absorbent, whereas granites and serpentine (green marble) are denser, but will still absorb liquids that are allowed to remain in contact with them for extended periods of time. In areas where stains are likely to develop, protective measures should be taken.
The use of a sealer will help prevent staining in most situations. Even a sealed surface can stain if left in contact with a staining agent for a long period of time. Therefore, all spills should be wiped up as soon as possible, and coasters or napkins should be set when serving food or drinks on a stone bar, table, or counter top. Soft drinks, coffee, tea, and fruit juices contain mild acids and can etch the polished surface of a stone and stain quite rapidly. These should be cleaned off immediately with a mild soap and warm water.
Remember - do not use any abrasive cleansers.

How do I clean my Natural Stone tiles & slabs?
In order to prevent staining or dirt build-up, regular cleaning is recommended. Stones should be rinsed weekly with warm water and a non-abrasive, clear, non-acidic soap. For polished marble and granite, we also recommend periodic application of a commercial polish. This polish remains on the surface of the stone, enhancing the luster and shine of the marble while affording an extra measure of protection.

If a stain occurs, how do I remove?
If stains do occur, or if you are restoring an ancient piece of stone, an oil and grease stain remover may be required. Whereas, a cleaner will wash off surface dirt, a poultice will actually act to draw out deep-seated dirt and stains from the stone's pores. Some poultice solutions are premixed, which is easily applied to light colored marbles. Several applications may be required for difficult stains, and darker marbles should be tested to make sure that the poultice will not bleach the stone. For recurring problems, and/or a very deep stain or scratches, a professional stone fabricator should be contacted.