The Stain Library

Stain

Deodorant stains

Two stains in one place. Fresh white transfer is surface deposit that rubs off dry, and yellow underarm build up is aluminium bonded into the fibre by sweat and set hard by heat.

  • TypeCombination
  • Heat sets itYes
  • Reviewed1 September 2026

If it has just happened, whatever it is on

Deal with a white mark while it is dry. Rub the deposit off with a clean dry cloth, a pair of tights or a piece of the same garment, using short strokes in one direction. Most fresh transfer lifts entirely without any liquid at all, and putting water on it first turns a surface deposit into a spread out stain. On a yellow underarm mark, the useful action is the one you take at the wash after wearing rather than months later. Do not put it in the dryer and do not iron it while any discolouration remains.

Do not do this

No iron, no tumble dryer, no hot wash and no steam until the mark has completely gone. Heat and the aluminium compound together damage fabric and lock the mark in. Do not reach for chlorine bleach on a yellow underarm mark: it reacts with the protein and aluminium build up and turns it darker and yellower while weakening the fibre. Do not mix chlorine bleach with vinegar or any other acid.

Deodorant on specific materials

Deodorant marks are the stain people most often make worse, and almost always in the same two ways: putting water on a dry white mark, and putting a yellowed shirt in the dryer.

The white marks

Antiperspirants work by delivering aluminium salts, usually aluminium chlorohydrate or aluminium zirconium tetrachlorohydrex gly, into the sweat duct where they form a plug. To get them there, a stick format carries them in white waxy solids. Both the salt and the wax transfer onto clothing as it goes on, and both dry to a chalky film that sits on top of the fibres.

Because it is sitting on top, it responds to mechanical removal. A dry cloth, a nylon stocking or the fabric rubbed against itself lifts most fresh transfer with nothing else involved.

The yellow marks

This is a different substance. Over repeated wearings the aluminium compound reacts with the proteins and salts in sweat, and the product of that reaction bonds into the fibre and stiffens it. It builds up slowly, it concentrates at the underarm where the fabric is in contact with skin all day, and it goes yellow as it ages.

Aluminium free deodorants do not cause it, which is a reliable way to tell whether the yellowing is from antiperspirant or from body oils alone.

Why heat is the dividing line

A dryer cycle or an iron does two things at once. It drives the residue further into the fibre, and it accelerates the reaction that produces the yellowing. Textile extension guidance is unusually direct about it: never iron or apply heat to a material carrying a deodorant stain, because the chemical and the heat together ruin most fabrics. A mark that has been through a hot dryer is far harder to shift and some never fully clear.

The bleach mistake

Chlorine bleach is the instinctive reach for a yellow mark on a white shirt and it is exactly wrong. It reacts with the protein and aluminium build up and darkens it, so the shirt comes out of the treatment more yellow than it went in, with weaker fibres at the underarm.

How deodorant behaves

A deodorant mark is two different stains that happen to arrive in the same place.

The white chalky one is fresh deposit: aluminium salts that have dried out on the fabric, plus the waxy carriers that carry them, which are usually stearyl alcohol, sodium stearate or glyceryl stearate. It is sitting on the surface and it comes off.

The yellow stiff one is old build up: the same aluminium salts reacted with the proteins and salts in sweat and bonded into the fibre over many wearings. That one is a chemical change in the cloth, and it is the one that sometimes does not come out.

Sources

What we checked and when. Where a manufacturer instruction disagrees with anything here, follow the manufacturer.

  1. Antiperspirant and deodorant stain removal, University of Georgia Extension authority

    University extension textiles guidance that deodorants and antiperspirants contain acidic aluminium compounds which change fabric colour, that undiluted hand dishwashing detergent rubbed into the mark and then laundered is the first method, and an explicit instruction never to iron or apply heat to a material carrying a deodorant stain because the chemical and the heat together ruin most fabrics.

    Checked 1 September 2026

  2. Sweat, deodorant and yellow underarm stains on dress shirts, Vogue Cleaners specialist

    Dry cleaner statement that the yellow is a reaction between the proteins and salts in sweat and the aluminium compounds in antiperspirant rather than sweat alone, that chlorine bleach reacts with that build up and turns the mark darker and yellower while weakening the fibres, and that dryer heat sets whatever the wash left behind so marks that have been through a hot dryer are far harder and some never fully clear.

    Checked 1 September 2026

  3. Aluminium zirconium tetrachlorohydrex gly publication

    Describes the aluminium and zirconium complex used as the active in many antiperspirants, which works by diffusing into the sweat duct and forming a colloidal plug, and records that when mixed with sweat it is thought to stain clothing with a yellowish tint and to stiffen the fabric where deposits build up.

    Checked 1 September 2026

  4. What causes white marks from deodorants, The Beauty Brains specialist

    Cosmetic chemists explaining that the chalky white marks come from two separate sources: aluminium chlorohydrate and aluminium zirconium salts drying out on the fabric, and the white waxy carriers used to deliver the active in stick formats, named as sodium stearate, stearyl alcohol and glyceryl stearate.

    Checked 1 September 2026

  5. How to remove deodorant stains from clothes, Sure UK manufacturer

    Antiperspirant manufacturer stating that deodorant stains are primarily caused by the aluminium salts in antiperspirants reacting with perspiration and fabric to leave chalky white marks at the underarm, and giving bar soap worked with a soft bristled brush on both sides of the fabric, and a bicarbonate of soda paste tested on a hidden area first, as the two household methods.

    Checked 1 September 2026

  6. Removing deodorant stains from black clothing, Mumsnet community

    Practical discussion of deodorant build up on dark clothing. Soaking the marked areas in white vinegar overnight and then washing with biological detergent at the highest temperature the garment allows is reported as what worked. Posters reject the widely circulated bicarbonate and hydrogen peroxide recipe on the grounds that it bleaches black fabric, which matches what peroxide does to dye.

    Checked 1 September 2026