In some cases, orange stains are linked to a type of bacteria known as Serratia marcescens. This bacteria thrives in damp environments and produces a pinkish-orange pigment.
You might have seen it before as pink slime in showers or around drains.
If towels are left damp for long periods — especially in humid bathrooms — bacteria can grow within the fibers. Over time, the pigmentation may appear as orange staining.
To prevent this:
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Always hang towels to dry fully.
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Avoid leaving wet towels in laundry baskets.
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Wash towels in hot water regularly.
Residue from Detergent or Fabric Softener
Using too much detergent is more common than people think. Modern washing machines use less water than older models, meaning extra soap doesn’t rinse out completely.
Leftover detergent residue can:
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Trap minerals
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Hold onto body oils
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Oxidize over time
All of this can contribute to discoloration, including orange staining.
Fabric softeners can make the problem worse by coating fibers and preventing proper cleaning.
Try this:
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Use slightly less detergent than recommended.
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Skip fabric softener occasionally.
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Run an extra rinse cycle for towels.
Why Is the Color Specifically Orange?
Great question.
The orange color usually indicates oxidation involving iron or certain organic compounds. When iron reacts with oxygen, it forms iron oxide — which is reddish-orange. The same chemical process that turns metal rusty can also affect fabrics.
In cases involving bacteria, the pigments naturally produced are often pink to orange in color.
That’s why the staining isn’t blue, green, or purple — it’s almost always some shade of orange or rust.
Can You Fix the Stains?
The good news: Sometimes.
Depending on the cause, you may be able to remove or lighten the stains with:
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White vinegar (helps dissolve mineral deposits)
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Baking soda
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Oxygen-based laundry boosters
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Specialized rust-removal laundry products
Avoid chlorine bleach if iron is involved — it can actually make rust stains worse.
However, prevention is far easier than removal.
How to Prevent Orange Stains in the Future
Here are practical steps you can take:
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Test your water for iron and hardness.
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Install a water softener if needed.
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Use the correct amount of detergent.
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Wash towels in hot water weekly.
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Let towels dry completely before storing.
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Consider using white towels specifically labeled as “bleach-safe” if you use acne treatments.
Small changes can make a big difference.
Final Thoughts