While this solution worked for me you need to use your judgment as to whether it is right for you.
Clean marble water stains.
Clean use the spray as your regular cleaner for the area where you get the hard water stains.
You make the call.
Here is how to make a baking soda poultice for cleaning water stains off marble.
To clean stained marble mix baking soda and water until it s a thick paste.
Use a damp cloth to wipe away the mixture repeating the process if the stain is still there.
Water stains are a common issue with marble countertops but pure water will not stain or damage marble.
Simple water stains and hard water stains.
Cleaning water stains off marble with a baking soda poultice.
Regular cleaning with this product will eliminate or at least minimize any crusty build up and keep your countertop looking shiny and clean.
There are two primary types of water stains.
This natural ingredient is a safe alternative for cleaning away scum and stains on stone surfaces.
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.
Baking soda is an alkaline powder and mild abrasive.
Keep that in mind when using any type of abrasive cleaner on your marble surfaces.
Simple water stains are often the result of condensation from a drinking glass that has been sitting on the countertop for too long.
With diligence you can keep your marble countertops clean and sparkling.
If you spilled anything oil based like a vinaigrette.
Apply it to the stain and cover it with plastic for 24 hours.
On the other hand hard water stains are the result of hard water getting into the pores of the stone.
For most organic food stains the marble institute recommends cleaning with a solution of 12 hydrogen peroxide and a few drops of ammonia.
I found a way to remove water stains from marble successfully.
For regular marble maintenance wipe up spills with a warm damp cloth and dry it with a cloth.
Water spots and hard water stains can usually be removed with a marble cleaner and a soft towel.
Etching is the cause of these seemingly transparent or chalky dull spots as seen in the photo at the top of the page.
Water stains can be easily removed from marble.
If not wiped up immediately water spots and hard water accumulations occur leaving unsightly stains.
Same for the tub and shower to keep soap scum at bay.
For more information about cleaning with marble cleaners see our marble cleaning how to guide.
You can either use regular marble cleaner or try removing the stain using grade 0000 steel wool.