I mixed about a tablespoon no i did not measure of the barkeeper s friend with a few drops of water in a small pyrex glass bowl to create a paste.
Water stains on marble sink.
Buff hard water accumulations using.
Add the polishing powder.
Fill the marble sink halfway with warm water and add 1 tablespoon of mild dish detergent or 1 4 cup of ammonia.
These stains can be the result of a water glass that was left on a marble countertop for too long or from hard water buildup around sinks and showers.
Rinse the paste away with clear water.
Add enough mb 11 polishing powder to cover the stain.
Cover the area with plastic wrap for 24 hours.
If you use ammonia put on a pair of rubber gloves to protect your hands.
Finally i wiped it off with a damp paper towel.
Rub the paste into the stain with a soft cloth.
Dry with a soft cloth.
Mold is a common problem in many bathroom settings.
Unsure which marble polishing powder.
Then i took an old toothbrush and scrubbed it on in the affected areas.
Above the etch mark wipe the surface clean of any grit of dirt.
Spray the polishing powder 2 to 3 times with the spray bottle to dampen the polishing powder.
Most likely the dark stain you are seeing around the sink drain is either from mold growth or a rust stain developing.
Mold can stain marble bathroom countertops floors etc.
I found a way to remove water stains from marble successfully.
It could also simply be water absorbing into the marble which will darken the area to a more gray color.
Marble countertops and other surfaces are no stranger to ink stains.