Why do mysterious black stains appear on clothes after washing?
Clothes emerge from the wash with unexpected dark or black stains, often forming along the seams, that resist bleach and ruin garments. This leaves people unable to remove the damage, stop it from happening, or figure out what causes the spots in the first place.
What the numbers show
Counted from the threads quoted below. How we count
- The most recent one is from October 2026.
- This comes up 18.2× more often in r/CleaningTips than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Looking up polyquatsDid this help you?
- 2Checking if the washing machine is dirtyDid this help you?
- 3Treating as potential oil stainsDid this help you?
- 4Spraying with spot cleaner before washingDid this help you?
- 5trying to bleach the fabricDid this help you?
- 6dyeing the garment white instead of bleachingDid this help you?
- 7trying to fix it with a fabric marker or fabric paintDid this help you?
- 8retiring the fabric to a cleaning outfit or bedtime wearDid this help you?
- 9bleaching the entire piece whiteDid this help you?
- 10dyeing the entire garment a darker colorDid this help you?
- 11Washing clean items in a warm wash with no soapDid this help you?
- 12Soaking in a 1:1 vinegar and water solution followed by a hot wash with powdered detergentDid this help you?
- 13Using specialized products to clean the washing machine seasonallyDid this help you?
- 14rinsing off the curtainDid this help you?
- 15wondering if it is caused by static electricity attracting dustDid this help you?
- 16Cleaning the rust, scum, and sludge off the tub using a cheap handheld power washerDid this help you?
- 17Using distilled white vinegar along with a couple of good washing cyclesDid this help you?
- 18Replacing the inner basket or drumDid this help you?
- 19scraping off residueDid this help you?
- 20using a steam cleanerDid this help you?
- 21Rubbing dawn dish soap into the spots, letting it sit, and running it back through the washer on a rinse cycleDid this help you?
- 22Sprinkling bicarbonate soda on the stains, placing baking paper over the top, and ironing over itDid this help you?
- 23Switching to dye-free and fragrance-free detergents like All Free and Clear or Arm & Hammer Sensitive SkinDid this help you?
- 24Coloring over the stains with a black markerDid this help you?
- 25Redyeing the pants with fabric dyeDid this help you?
- 26Checking all unlabeled spray bottles at workDid this help you?
- 27Rewashing without detergentDid this help you?
- 28Adding an extra rinse cycle when doing laundryDid this help you?
- 29Using less detergentDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Both my wife and I didn’t notice this on my pants this morning and this is now the 3rd-4th pair of clothing that gets random bleach stains .”source ↗
“I was going through my hamper before I threw my clothes in the laundry machine today, and I noticed these stains had developed. Didn’t go away after they went in the machine. What on earth could this be?”source ↗
“This is an irreplaceable and very sentimental shirt so I will be devastated if it is something truly permanent that can’t be fixed”source ↗
“I noticed a bunch of irregular grey marks/patterns on the liner that was completely plain when I put it in.”source ↗
“There’s some residue on the tub also.. What are these?”source ↗
“I just finished my laundry and this is the only shirt that had this stain. It was only in the front too! What is it? How can I remove it?”source ↗
“Been having this constant black stains that ruins all my clothes. Please let me know what are these and how can i remove the stain / stop it from happening.”source ↗
“I washed this vintage jacket today (white, 100% cotton ) with cold water and after washing, it suddenly formed these dark edges at the seams.”source ↗
“I already tried to bleach it but nothing happened. I don´t know what to do?”source ↗
“What I don't get is, how on earth did it get on my back? I didn't really do anything that day, it was raining.”source ↗
“I had similar staining from Lysol laundry disinfectant”source ↗
“The residue on the tub is also only on the side that the liner was touching”source ↗
“My detergent does this to my dark clothes a lot, it’s annoying”source ↗
“I’ve blamed my washer before for the stains but I’ve taken my laundry to families house and laundry mats to test it and the stains still appear so I guess it is the detergent”source ↗
“Someone at my job once put bleach in something clearly not labeled as bleach and I ruined my clothing.”source ↗
“How do I avoid getting these white streaks in my black shirts? It’s only my shirts getting this after I use the laundry mat.”source ↗
“Sorry my first post was a little harder to see because i was wearing the shirt. The shirt doesn’t smell like anything so i’m wondering if it’s dye? Or someone mentioned it could be from my washing machine”source ↗
“My washer is leaving fabric softener all over the top of the drum(?) also it’s leaving little stains on clothes when they are coming out. Do I just need a new one?”source ↗
“Even a little bit of rust will always leave stains on white clothes.”source ↗
Where this came up
People with this problem also raised
- 2Clothes coming out of the wash covered in lint
- 3Why does a brand new washing machine leave soap in clothes?
- 3Why do white mesh shoes turn yellow after washing?
- 6How to get dye out of white clothes after a mixed wash
- 12Why does my clothes dryer sound like a loud vacuum?
- 63How to get stubborn makeup out of white clothes