How to Remove Hard Water Stains From Quartz

A cloudy patch by the faucet, a ring where a glass sat, white spots that will not wipe off. On quartz, these are usually minerals left behind by water, not a stain in the countertop.

The steps below come from two quartz makers, MSI and Caesarstone. They mostly agree, with one difference on timing.

What Hard Water Leaves Behind

Caesarstone says “A hard water stain is a cloudy, chalky, or whitish deposit left behind when water with a high mineral content, especially calcium and magnesium, dries on a surface.”

MSI says these marks “are usually found as cloudy films or white marks around sinks, faucets, and other places where hard water is present.” It also warns that “If left in place, these deposits can calcify into a textured surface that traps dirt and permanently dulls the finish.” So it is worth clearing them early.

Is It Minerals or Soap?

Sometimes the whole counter looks cloudy, from end to end. MSI says “Generally, the whole slab is often cloudy from using too much soap.”

For soap film, MSI’s fix is simple: “This residue can be removed by rinsing the surface with warm water and rubbing vigorously with a dry cloth.” Then use less dish soap in your daily wipe down.

If the cloudy spots stay after that, they are probably minerals. Read on.

Method One: Diluted Vinegar

Both makers allow vinegar on quartz, but only diluted and only briefly. Acid can harm the resin that holds quartz together.

MSI says to clean the deposits “with a diluted vinegar solution (1 part vinegar to 1 part water).” Put it only on the spots. Then: “Do not leave the solution on the surface for more than two minutes, as the acidity can eventually etch the resin.”

Caesarstone says “a solution of half white vinegar and half water is often effective at dissolving the mineral deposits in hard water stains (limescale).” It says to leave it on “for a few minutes.”

The mix is the same. The timing is a little different, so the shorter one is the safe choice: two minutes at most, then rinse.

Finish the same way. MSI says “Rinse well with clean water and dry right away with a microfiber cloth to prevent new spots.” Caesarstone says “Always rinse the area thoroughly with clean water immediately afterward and dry it completely to prevent dulling the surface.”

Method Two: A Gentle Gel Cleaner

Caesarstone’s steps use a nonabrasive gel cleaner:

“Apply your chosen nonabrasive cleaner such as Soft Scrub Liquid Gel to a damp cloth or paper towel. Never apply the product directly to the countertop.”
“Gently rub the stained area using a circular motion.”
“Once the stain is gone, rinse the area completely with clean water.”
“Dry the countertop with a soft, clean cloth to prevent new water spots.”

Not every quartz maker agrees on that product. Cambria lists Soft Scrub among the cleaners to keep off its quartz. Check which brand you have and follow its care guide. Our quartz stains guide explains where the makers differ.

What Not to Use

Caesarstone says “You should never use abrasive tools such as scouring pads, steel wool, or heavy-duty scrub sponges (including the abrasive side of a standard kitchen sponge).”

It also says “You must strictly avoid using bleach, ammonia, strong acids, or solvents (such as paint thinner or permanent markers) directly on quartz.” That is why both makers only allow vinegar diluted with water.