How to Remove Hard Water Stains and Limescale (Without Hurting Your Surfaces)

Step by step

1. 1

   Mix the spray

   Put on your gloves. Pour 1 cup of white vinegar and 1 cup of water into a clean spray bottle and shake it. Equal parts is the strength Moen gives for water spots on its faucets.

2. 2

   Wet the crust and let it work

   Spray the white spots until they are good and wet. On faucets and other metal fixtures, keep it short, because Moen allows its vinegar mix only for a limited time. On a tub, a sink or tile, let it sit until the crust starts to soften, and spray again if it dries.

   What it looks like when it is working: on thick crust you may see tiny bubbles. That is the acid reacting with the minerals and letting off carbon dioxide gas.

3. 3

   Scrub gently

   Rub the spot with the soft side of a non-scratch sponge, using small circles. Do not reach for a scouring pad. Moen warns against abrasive sponges and steel wool on several of its finishes, and DreamLine, a shower door maker, says abrasive sponges may scratch glass.

   What it looks like: if the spot still feels rough when you run a fingertip over it, wet it again and scrub again.

1. 4

   Rinse right away

   Rinse the area well with plain water. Moen says to rinse any cleaner off thoroughly right after use, and that matters most on metal finishes.

2. 5

   Dry it completely

   Wipe everything dry with a microfiber cloth. This is the step people skip, and it is the one that keeps the stain from coming back, because every drop you leave behind dries into a little new spot.

   What it looks like when it worked: smooth, shiny metal or clear glass, with no chalky ring when it dries.

3. 6

   For thick crust, use CLR the way the label says

   Use it only where the label allows, such as tubs, sinks and porcelain. Test a hidden spot first, because the label says it may etch older sinks, tubs and tiles.

   1. Open a window or turn on the fan, and keep your gloves on.
   2. For light buildup, mix equal parts CLR and water. For stubborn buildup, use it full strength.
   3. Apply it, wait 2 minutes, then rinse promptly and thoroughly with cold, clean water.
   4. Repeat if you still see crust.

When it will not work, and what to do instead

Some white marks do not budge, and a few are not stains at all. Here is how to tell what you are looking at.

• You left vinegar on overnight and the faucet looks dull. It makes sense that a longer soak would work better. But Moen limits vinegar on its finishes to a short time and wants it rinsed off right away. Use short rounds and repeat them instead.
• The glass stays cloudy no matter what. DreamLine says hard water can etch the surface of the glass over time if it is left to dry. That is a change in the glass itself, so cleaning may not bring it back, but drying the glass after every shower keeps it from getting worse.
• The stains come right back. That is your water, not your cleaning, and drying fixtures after use is the cheapest fix. Virginia Tech’s extension program says softening all the water coming into the house is one option.
• The crust is in the toilet bowl or on the shower head. Those have their own pages: How to remove a toilet bowl ring and How to clean a shower head without taking it off.
• It is on marble or other stone. Stop here. Acid can etch the stone, so this is a job for a stone care pro.

Why it works

Hard water is water carrying a lot of dissolved calcium and magnesium. The U.S. Geological Survey calls water hard once it carries more than 120 milligrams of those minerals per liter.

When a drop of that water dries on your faucet, the water leaves and the minerals stay. Drop after drop, they build into the white crust called scale or limescale.

The USGS says hard water can leave solid calcium carbonate deposits, the same mineral an eggshell is made of. The University of Illinois explains that an eggshell in vinegar reacts and gives off carbon dioxide bubbles. Your faucet crust does the same thing in a thinner layer.