FAQ

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Clean grease stains gently with one of the following: a soft, liquid cleanser with bleach, a household detergent, ammonia, mineral spirits or acetone. If the stain is oil-based (grease, tar, cooking oil, milk, cosmetics), it must be chemically dissolved so the source of the stain can be flushed or rinsed away. An oil-based stain will darken the stone.

 

Organic stains (coffee, tea, fruit, tobacco, paper, food, urine, leaves, bark, bird droppings) may cause a pinkish-brown that may disappear after the source of the stain has been removed. Outdoors, after stain sources have been removed, normal sun and rain action will generally bleach out the stains.

Do not use acids or flame tools to strip paint from the stone. Paint strippers can etch the surface of the stone -- re-polishing may then be necessary. Follow the manufacturer's directions for use of these products, taking care to flush the area thoroughly with clean water. Protect yourself with rubber gloves and eye protection, and work in a well-ventilated area. Use only wood or plastic scrapers for removing the sludge and curdled paint. 

 

Normally, latex and acrylic paints will not cause staining. Oil-based paints, linseed oil, putty, caulks, and sealants may cause oily stains. Refer to the section on oil-based stains.

 

Efflorescence is a white powder that may appear on the surface of the stone. It is caused when water carrying mineral salts from below the surface of the stone rise through the stone and evaporate. When the water evaporates, it leaves the powdery substance. If the installation is new, simply dust-mop or vacuum the powder. You may do this several times as the stone dries out. Do not use water to remove the powder; it will only temporarily disappear.

 

In our experience, if you have a marble floor by the front desk of an NYC hotel (where visitors walk by 24/7), the floor needs to be honed and polished every other week. We have experiences with other hotels and apartment buildings that marble floors need to be honed and polished once every 2 or 3 months.

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