Among the 4,855 laundry-service complaints filed with Korea's Consumer Agency between 2022 and 2024, colour change (fading and discolouration) accounted for 855 cases (17.6%) and staining (dye transfer and soiling) for 813 (16.8%). Together that is a third of everything — colour problems. The heaviest month is May, with 569 cases (11.7%), up 41.9% on April, when winter clothes go in for cleaning.
1. How common is this. Across 4,855 complaints, colour change 17.6% plus staining 16.8% — a third of everything is a colour problem. The heaviest month is May, up 41.9% on April, when winter clothes go in.
2. Where the risk is. Soaking in diluted bleach strips colour. In the Consumer Agency's test, every one of 11 products changed the dyed swatch when soaked — while none did when used with detergent in the machine. How you use it decides the outcome.
3. What to do. The first three minutes matter more than the product — act fast, blot rather than rub, cold water first. If you cannot identify the stain, default to cold. And twenty seconds with a damp white cloth on a new garment prevents dye transfer.
The first three minutes decide it
Three rules come before choosing any product. Break them and nothing you apply afterwards works well.
- Fast. The moment it lands is the easiest it will ever be. Stains set into the fibre as they dry, and oxidise into a different colour after that.
- Blot, never rub. Rubbing spreads the stain through the weave and damages the surface. Press a tissue or dry cloth against it and lift the stain out. The trick is to place an absorbent cloth underneath and work from above.
- Cold water first. Blood, milk and egg are protein stains that set hard in hot water. If you can't identify it, use cold.
Of the 978 disputes attributed to launderers, 14.1% (138 cases) were “inadequate stain removal.” Professionals miss these too — which means your own first response before handing it over changes the outcome substantially.
Treatment by stain type
Stains fall into four families — oil, protein, pigment and ink — and each dissolves in something different. Learn the families and you can judge stains that aren't in the table.
| Stain | Family | Order | Watch out |
|---|---|---|---|
| Coffee, tea | Pigment | Cold rinse → dish soap pre-treat → soak in oxygen bleach if it persists | Hot water fixes the pigment |
| Kimchi liquid, tomato | Pigment (+ oil) | Cold rinse → dish soap → oxygen bleach | On whites, sunlight fades the residue |
| Oil, cosmetics, lipstick | Oil | Apply dish soap directly, leave, then wash | Water first makes it worse |
| Blood, sweat, milk | Protein | Cold water only → soak in percarbonate → wash | Never hot — it sets permanently |
| Ballpoint ink | Ink | Tissue underneath, dab with rubbing alcohol to transfer it down | Broad rubbing spreads it. Test coloured fabrics first |
| Yellowed underarms | Oxidised sebum | Soak 1–2 hours in 40–50°C water with percarbonate → wash | Chlorine bleach makes yellowing darker |
| Mud | Solid particles | Let it dry completely, brush off, then wash | Rubbing it wet drives particles into the weave |
Mud is the one row that runs backwards. Everything else is easier before it dries; soil is particulate, so drying and brushing off works far better. Worked wet, the grit embeds itself.
Whichever method you choose, the fibre has to survive it. Apply the detergents and temperatures above to wool, silk or technical fabrics and the garment will fail before the stain does. What each fibre is vulnerable to is tabulated in the fabric care guide — check there first for anything you value.
Bleach removes colour when you soak in it
This is the part that is commonly misunderstood. Korea's Consumer Agency published a comparative test of 11 laundry bleach products in January 2024:
| Test condition | Colour change on dyed fabric | Stain removal |
|---|---|---|
| Normal wash (with detergent, in the machine) | None — all products | Liquid types better on sebum and dust |
| Soaking (dissolved in water, left to stand) | Change in every product tested | Powder types better on oil and soil |
In short: soaking in bleach removes the stain and some of the colour with it. All 11 products (8 powder, 3 liquid) were oxygen-based, and it happened anyway. “Oxygen bleach is safe on colours” holds only for a normal wash cycle.
The working rule follows from that. Whites, or garments whose colour is already compromised, can be soaked. Coloured garments should go through a normal wash with detergent instead. If a stain is bad enough to need soaking, decide first whether you accept losing some colour.
One more thing: never combine oxygen bleach with chlorine bleach. The Consumer Agency warned that using the two together risks a violent reaction and chlorine gas. People mix them hoping for a stronger result — this is a safety issue, not a laundry one.
Before using any bleach, check the triangle symbol on the label. An X means no bleach. How to read the symbols is in the fabric care guide.
Dye transfer — twenty seconds of prevention
Colour migrating from one garment to another is the most avoidable stain there is.
| Step | Do | Why |
|---|---|---|
| 1 | Test new or dark garments with a damp white cloth on a hidden area | If colour transfers, wash separately for the first few cycles |
| 2 | Separate whites and lights from darks | The most reliable prevention there is |
| 3 | Wash cold | Hotter water releases more dye |
| 4 | Hang the load immediately | The longer it sits wet and bunched, the more transfers |
Step four catches more people than the others. You sort carefully, wash cold, then leave the load in the drum for a few hours and the transfer happens there. When a mixed load is unavoidable, a colour-catcher sheet absorbs loose dye from the water and limits the damage.
If transfer has already happened, before it dries is the only window. Once dry, the dye is fixed and the job gets much harder. Rewash immediately; if colour remains, soak in oxygen bleach — accepting, as above, that the garment's own colour may go with it.
Mistakes you cannot undo
- Hot water on a protein stain — blood, milk and egg set into the fibre and no detergent lifts them afterwards.
- Rubbing hard at a stain — the stain widens and the abraded patch takes on a different sheen.
- Soaking coloured items in bleach — the original colour goes too, and patchy loss shows more than the stain did.
- Mixing oxygen and chlorine bleach — risk of chlorine gas. Not a laundry problem.
- Drying a dye-transferred garment — drying fixes the dye.
- Putting a stained item in the dryer — heat sets the stain. Check before drying, not after.
That last one pays for itself. When the cycle ends, look at the item before you hang it; if the stain is still there, treat it again. Heat and time fix stains whether the source is a dryer or a sunny balcony. Sometimes the machine itself is the culprit — see washing machine care and bulky items. For humid-season odour and marks, managing humidity and mould in monsoon season is the companion piece.
Questions that remain
What do I do in the first moments after finding a stain?
Three things, before you choose any product. Move fast — a stain sets into the fibre as it dries, and oxidises into a different colour after that. Blot, never rub — put a dry cloth underneath the stain and press from above so it transfers downward. And reach for cold water first: protein stains such as blood, milk and egg cook solid in hot water and bond to the fibre. If you cannot identify it, cold is the safe default. Break these three and nothing you apply afterwards will work well.
Mud has got on it. Should I wash it straight away?
Mud is the one that runs backwards. Every other stain is easier before it dries, but soil is solid particulate, and brushing it off once it has dried out completely works far better. Rub it while wet and you drive the particles between the fibres. Of the seven rows in the table above, it is the only stain exempt from the “move fast” rule.
Isn't oxygen bleach meant to be safe on coloured clothes?
Only in a normal wash cycle. In the Korea Consumer Agency's January 2024 test of 11 laundry bleaches, running them in the machine with detergent produced no colour change on dyed fabric in any of the 11, while dissolving them in water and leaving the fabric to soak produced a change in all 11. Every product tested was oxygen-based, and it happened anyway. So coloured items go in with detergent rather than into a soak. Separately, never combine oxygen bleach with chlorine bleach — the agency warns of chlorine gas. That is a safety issue, not a laundry one.
I sorted by colour and washed cold, and the dye still transferred.
Usually it is the time the load sat in the machine afterwards. The longer garments stay balled up and wet, the more the dye already released into the water migrates. Hang the load as soon as the cycle ends. When you have no choice but to mix a load, a dye-catcher sheet absorbs loose dye and blocks a fair amount of it. If the transfer has already happened, before it dries is the only real chance — once dry, the dye is fixed and it gets much harder.
When should I check whether a stain has actually gone?
Before you hang it or put it in the dryer. Heat and time set stains, so anything that goes into drying with the mark still there tends to resist a second wash. Look at the garment once when the cycle ends, and re-treat on the spot if the mark survived. It takes a few seconds, and it heads off two of the six irreversible mistakes at once.
Sources and where to verify
- Korea Consumer Agency — laundry service complaint statistics (4,855 cases 2022–2024, by defect type and month)
- Korea Consumer Agency textile committee findings — analysis published on the North Jeolla Province consumer board
- Consumer24 — analysis of laundry service disputes
- Consumer24 — always keep your laundry receipt
Written as of July 2026. The bleach findings come from the Consumer Agency's January 2024 comparative test of 11 laundry bleach products; the dispute statistics from its April 2025 and November 2024 releases. Our tooling could not read the agency's site at the time, so the originals were not read directly and were cross-checked against a public-sector republication and multiple press reports. Figures such as bacterial counts in drums or removal rates by wash temperature appear in many guides; no credible test data could be found for those, so they are not used here.
