Coffee
Coffee stains come from tannins and, if milk was added, proteins. Tannins are water-soluble when fresh but become increasingly resistant when heated or dried.
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Frequently asked questions
Why did my coffee stain come back after washing?
This happens when the stain was partially treated — tannin molecules left in the fabric migrate to the surface when heat is applied in the dryer. Re-treat and wash in cold water.
Does milk coffee stain worse?
Yes — coffee with milk adds a protein component that can be heat-set. Enzyme cleaners are more effective for milky coffee stains.
Can I use hot water on a coffee stain?
No — hot water sets the tannin stain. Always use cold water for rinsing and washing.