You should use only products made specifically for cleaning marble.
Cleaning marble with red clay stains.
The best way to address mold stains is to use a product that is specifically designed for removing mold and mildew stains on marble such as this one.
Ink stains as with organic stains you can use a poultice made with 6 percent hydrogen peroxide to remove any ink stains.
Gently rub the baking soda into the marble with a soft damp cloth.
Make a paste with either diluted ammonia or white vinegar and an absorbent powder such as salt or baking soda cover the stain with a thick layer of the paste.
Cleaning red clay from concrete is an easy process when using the correct tools.
After cleaning with water only we were not happy with the results the clay.
Make an acetone poultice with talcum powder baking soda or any other absorbent powder such as cornstarch or flour.
Marble sealers are impregnator sealers that are made up of a liquid based solvent typically water based and a solid resin.
I filmed this video in frustration.
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Instead call a professional to repair the damage or clean the stains.
Cover the area with plastic wrap to hold the moisture in.
Marble sealer is a surface treatment applied to the marble to clog the pours of the marble surface and prevent foreign substances from penetrating the surface thus preventing stains.
Immediately wipe a marble coaster with a damp cloth if it comes in.
Then rinse with water and dry with a soft towel.
You do not want to scrub because that can damage the surface.
Once all surface grime is removed you can go to work on the stains.
If you spilled anything oil based like a vinaigrette.
Sprinkle a little baking soda onto the surface of the marble.
This is a very searched situation and it is how to clean brick with acid.
Marble requires extra maintenance especially when it comes in contact with an acid based liquid such as juice or tomato sauce.
Since they are below the surface no marble cleaning product will touch them.