MSI Granite – Cleaning Tips
March 24, 2019
How to clean your MSI Granite Countertop
Clean stone surfaces with a neutral cleaner, stone soap, or a mild liquid dishwashing detergent and warm water.
Similar to any item cleaned in your home, an excessive concentration of cleaner or soap may leave a film and cause streaks. Follow manufacturer recommendations.
Use a clean rag mop on floors and a soft cloth for other surfaces for best results.
Rinse the surface thoroughly after washing with the soap solution and dry with a soft cloth.
Change the rinse water frequently.
In the bath or other wet areas, soap scum can be minimized by using a squeegee after each use. To remove soap scum, use a non-acidic soap scum remover or a solution of ammonia and water (about 1/2 cup ammonia to a gallon of water). Frequent or over-use of an ammonia solution may eventually dull the surface of some stone types.
In outdoor pool, patio or hot tub areas, flush with clear water and use a mild bleach solution to remove algae or moss.
Many suppliers offer products used for stone cleaning.
Products containing lemon, vinegar or other acids may dull or etch calcareous stones.
Scouring powders or creams often contain abrasives that may scratch certain stones.
Many commercially available rust removers (laundry rust stain removers, toilet bowl cleaners) contain trace levels of hydrofluoric acid (HF). This acid attacks silicates in addition to other minerals. All stones, including granite and quartzite, will be attacked if exposed to HF.
Do not mix ammonia and bleach. This combination creates a toxic and lethal gas.
Stain Identification Tips
Identifying the type of stain on the stone surface is the key to removing it. Stains can be oil-based, organic, metallic, biological, ink-based, paint based, acid-based. If you don’t know what caused the stain, consider likely staining agents that may have been present.
Here are some questions you consider:
Where is the Stain Located?
Is it near a plant, a food service area, an area where cosmetics are used?
What color is it?
What is the shape or pattern?
What occurs in the area around the stain?
Stain Removal Steps
Surface stains can often be removed by cleaning with an appropriate cleaning product or household chemical.
What Type of Stain is It?
The following sections describe the types of stains you may have to deal with and the appropriate household chemicals to use and how to prepare and apply a poultice to remove the stain.
(grease, plumbers’ putty, tar, cooking oil, milk, cosmetics)
An oil-based stain will darken the stone and normally must be chemically dissolved so the source of the stain can be flushed or rinsed away. Clean gently with a soft, liquid cleanser with one of the following: household detergent, mineral spirits, or acetone.
(coffee, tea, wine, fruit, tobacco, paper, food, urine, leaves, bark, bird droppings)
May cause a pinkish-brown stain and may disappear after the source of the stain has been removed. Outdoors, with the sources removed, sun and rain action will generally bleach out the stains. Indoors, clean with 12% hydrogen peroxide (hair bleaching strength) and a few drops of ammonia.
(iron, rust, copper, bronze)
Iron or rust stains are orange to brown in color and follow the shape of the staining object such as nails, bolts, screws, cans, flower pots, metal furniture. Copper and bronze stains appear as green or muddy-brown and result from the action of moisture on nearby or embedded bronze, copper or brass items. Metal stains must be removed with a poultice.
(See website on Using a Poultice – www. marble-institute.com/poultice)
Deep-seated, rusty stains are extremely difficult to remove and the stone may be permanently stained.
(algae, mildew, lichens, moss, fungi)
Clean with diluted cleaning solution. Use a 1/2 cup of any of the following: ammonia, bleach, or hydrogen peroxide and a gallon of water. Reminder: do not mix bleach and ammonia.
(magic marker, pen, ink)
On light-colored stones, clean with bleach or hydrogen peroxide. On dark colored stones, clean with lacquer thinner or acetone.
Small amounts can be removed with lacquer thinner or scraped off carefully with a razor blade. Heavy paint coverage should be removed only with a commercial “heavy liquid” paint stripper available from hardware stores and paint centers.
These strippers normally contain caustic soda or lye. Do not use acids or flame tools to strip paint from stone. Paint strippers can etch the surface of the stone; repolishing may be necessary.
Follow the manufacturer’s directions for use of these products and 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.
Water Spots and Rings
(surface accumulation of hard water)
Buff with dry 0000 steel wool.
Fire and Smoke Damage
Older stones and smoke or fire stained fireplaces may require a thorough cleaning. When the smoke is removed, there may also be some etching (due to carbonic & other acids in smoke). Commercially available “smoke removers” may save time and effort.
(caused by acids left on the surface of the stone)
Some materials will etch the finish but not leave a stain. Others will both etch and stain. Contact your stone dealer or call a professional stone restorer for refinishing or repolishing etched areas.
(a white powder that may appear on the surface of the stone)
It is caused by the deposition of mineral salts carried by water from below the surface of the stone. When the water evaporates, it leaves the powdery substance. If the installation is new, dust mop or vacuum the powder.
You may have to do this several times as the stone dries out. Do not use water to remove the powder; it will only temporarily disappear. If the problem persists, contact your installer to help identify and remove the cause of the moisture.
Scratches and Nicks
Slight surface scratches may be buffed with dry 0000 steel wool. Deeper scratches and nicks in the surface of the stone should be repaired and repolished by a professional.