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How to Get Hard-Water Spots Stains Out

Mineral deposits — vinegar dissolves them on hard surfaces.

Quick answer

Fresh Hard-Water Spots on Cotton

Before you startAlways test any treatment in an inconspicuous area first, and check the garment's care label before you begin.
  1. Test in an inconspicuous area first.
  2. Blot — never rub — with a clean white cloth dampened with cool water.
  3. Check the care label; use only what it allows.
  4. If the stain persists, or the item is delicate or valuable, take it to a professional cleaner.

Don’t do this

  • When no safe home treatment is documented, a professional cleaner is the right call.

Tip: Hard-water marks on fabric usually lift in a normal wash with detergent; persistent marks may need a professional cleaner.

Sources: Consumer Reports; Michigan State University Extension (PDF); King University stain removal guide (PDF)

For dried stains or other materials, use the lookup tool below.

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Hard-Water Spots on specific materials

Hard-Water Spots on CottonFresh & dried steps Hard-Water Spots on LinenFresh & dried steps Hard-Water Spots on PolyesterFresh & dried steps Hard-Water Spots on NylonFresh & dried steps Hard-Water Spots on SilkFresh & dried steps Hard-Water Spots on WoolFresh & dried steps Hard-Water Spots on DenimFresh & dried steps Hard-Water Spots on LeatherFresh & dried steps Hard-Water Spots on SuedeFresh & dried steps Hard-Water Spots on Upholstery fabricFresh & dried steps Hard-Water Spots on Carpet/rugFresh & dried steps Hard-Water Spots on WoodFresh & dried steps Hard-Water Spots on Stainless steelFresh & dried steps Hard-Water Spots on Stone/marbleFresh & dried steps Hard-Water Spots on Plastic/laminateFresh & dried steps

Frequently asked questions

What causes hard-water spots?

Calcium and magnesium left behind when water evaporates. White vinegar dissolves the mineral deposits.

Can I use vinegar on marble?

Never — acids etch marble and natural stone. Use a pH-neutral stone cleaner or a professional.

Safety rules for every treatment
  • Test every treatment in an inconspicuous area first — some treatments can fade dyes or damage finishes.
  • Blot a wet stain; never rub it. Rubbing pushes the stain deeper into fibers.
  • Check the garment's care label and follow it — skip any step the label prohibits.
  • Never put the item in the dryer until the stain is completely gone; heat sets most stains.
  • Never mix ammonia with chlorine bleach — the fumes are toxic and dangerous.
  • Never use chlorine bleach on rust — it can intensify the stain.
  • Rubbing alcohol is flammable and can fade some dyes; spot-test first and ventilate the area.
  • Acetone dissolves acetate, triacetate, and modacrylic fabrics — check the fabric label first.
  • Use cold water first on blood and other protein stains; hot water sets them.
  • When in doubt — a valuable, vintage, or delicate item — take it to a professional cleaner instead.

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