You can wet stand the stain on that cultured marble sink sure but then you ll remove the finish and end up with a bare spot.
Marble countertop stain remover.
Step 1 protect marble from scratches.
And you ll have to cover that spot with high gloss finish and match the sheen to the rest of the sink.
For minor paint stains you can use lacquer thinner to remove them.
Use coasters and mats on marble countertops to protect them from glasses and appliances step 2 clean marble frequently.
A marble poultice is used to draw stains out of marble surfaces.
Sprinkle white powdered chalk over the entire top of the napkin in a layer about a half inch thick.
As with organic stains you can use a poultice made with 6 percent hydrogen peroxide to remove any ink stains.
Can usually be removed with a marble cleaner and a soft towel.
Like many other stains that are common on marble you can remove etch marks using a poultice.
Draw out the stain from your marble countertop using a poultice.
The process may need to be repeated but no special considerations are needed for stain removal via marble poultice for ink stains.
You can also use corn starch especially on grease stains hydrogen peroxide pads on lighter stones or rubbing alcohol spray to remove stains from marble but applying marble poultice is your most efficient option.
Ink stains can be removed with a marble poultice made with a solvent of 6 hydrogen peroxide or ammonia.
See below for marble poultice process.
Marble stains very quickly especially if a liquid is allowed to sit untouched for a period of time 1 x research source clean up orange juice wine and coffee as soon as they are spilled.