Marble Countertop Water Stains. This occurs when water containing large amounts of mineral deposits, like calcium and magnesium (commonly called hard water), is allowed time to dry on your marble surface. "Water stains" are a common issue with marble countertops but pure water will not stain or damage marble. Water spots are defined as water deposits built up on your marble surface.
Hard water stains on your marble countertops are caused from hard water (water containing minerals including calcium and magnesium) being allowed to dry on the marble surface—as the water evaporates, the minerals are left behind. This unmistakable dark stain can be problematic due to the high acidity content of coffee beverages. I found a way to remove water stains from marble successfully.
What's also important to know is what not to use in order to best preserve your granite.
You treasure your gorgeous marble countertops in your kitchen or bathroom.
I found a way to remove water stains from marble successfully. If water spots mar your marble countertop, clean and polish the marble to restore its former perfection. Then apply plastic wrap over the top.