Leave for an hour to overnight.
You tube remove stains from marble table.
Stains on marble countertop was left by using plumbers putty oil from plumbers putty left greasy 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.
Then apply plastic wrap over the top.