Cleaning Marble Mouthwash Stain


Apparently our mouthwash container had a leak and now there is an oval stain on our marble bath vanity.

The mouthwash is blue but the stain is not. It just darkened the marble.


The color of the spot is key to diagnosing the type marble stain.

A dark spot left where the mouthwash absorbed is a true marble stain.

This is different than the lighter or chalky dull spots sometimes confused as stains but are actually etch marks from acidic or chemical corrosion of the marble surface.

I mention this because depending on the type of substance you can get a stain, an etch mark, or both in the same spot. This could happen with a mouthwash stain.

Repair or removal is completely different for each type.

And you may not see the etch mark until the stain is removed. More on that below.

To remove a mouthwash stain from marble you'll need to make and apply a poultice... possibly several times, but you should be able to remove it.

More than likely, the mouthwash is acidic enough that it has also etched or corroded the surface destroying the polish, so you'll have to re-polish the surface after removing the stain.

Make A Mouthwash Stain Removal Poultice

Making a stain-removal poultice is simple and you probably have most ingredients already. Note that the exact mix or ingredients will change depending on the type of liquid or substance (oil, dye, organic, etc.) caused the stain.

To remove the mouthwash marble stain we're going to use hydrogen peroxide in the poultice, but that would change for a stain from some other liquid.

1. Buy 12% Hydrogen Peroxide (the 3% drug store kind is too weak) and some
corn starch or baking soda. Even flour can work.

2. Mix the corn starch and hydrogen peroxide into a paste like peanut butter. This is your "poultice."

3. Apply the poultice to the stain 1/2 thick with a 1/2 border.

4. Cover the poultice with plastic wrap, seal the edges with blue painters tape and let it sit 48 hours. Masking tape can be used but it may leave a sticky residue.

5. Remove the plastic wrap, but don't touch the poultice. Let it dry another day until it is hard. The hydrogen peroxide breaks down the stain and as the powder dries out it sucks it all up.

6. Scrap off the poultice with plastic or wood spatula and clean with hot water or a marble cleaning spray which is best for regular cleaning.

7. Repeat the above steps (if necessary) until the mouthwash stain is gone.

Deep or old marble stains may need several applications of a poultice.

Repolishing a Mouthwash Etch Mark

If after removing the mouthwash stain you notice a dull spot on the marble countertop, then the mouthwash also etched the surface.

Remember, this spot is different than the mouthwash stain.

To repair the mouthwash etch mark...

Buy an ETCH REMOVER / Marble Polishing Paste suitable for removing etch marks.

The procedure to remove an etch mark with this product is simple as well (basically just apply, wet, rub for 10-20 seconds, wipe off immediately) and will restore the shine and color of the marble countertop.

If you don't get satisfactory results from this procedure, then the damage is severe and will require professional help. But I think you'll be able to get the job done yourself on this one as severe etching is rare.

Comments for Cleaning Marble Mouthwash Stain

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Will a Poultice Work on Quartz?
by: Anonymous

Will this process of applying a poultice work for stains or etching on quartz countertops as well?

==== Countertop Specialty comment:

No, a poultice will not work to remove stains or discoloration from a quartz countertop.

Quartz is stain-resistant but not stain-proof. So foods and drinks can leave stains and many chemicals can cause dull or bleached-out discoloration that may look similar to etching on marble.

However, the stains and/or etching-type damage that discolor a quartz countertop occur in a different manner than on natural stone or marble.

And thus, the solutions are different.

Stains on marble occur when a substance absorbs into the stone. A poultice draws out the stain.

When quartz is stained or discolored by acidic or harsh products it is often permanently damaged. The substance either stains the resin or bleaches out the coloring dyes within the resin used to make quartz countertops.

One major advantage of marble and natural stone over many man-made countertop materials is that stone can almost always be repaired to like-new condition.

blue mouthwash stain
by: Anonymous

My mouthwash left a blue ring on the granite countertop. It's not dark but the white parts are light blue. Do I use the same procedure or is there something else for a quick fix?

Thank for the help

=== Admin Comment:

Yes, use the procedure provided for removing the stain and if after removing the stain you notice you also have "etching"... dull, whitish or "clear" spots, then you'll also need to use the Etch Remover product recommended.

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