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How to Get Sunscreen Stains Out of a Hoodie

Orange sunscreen marks on a hoodie come from avobenzone reacting with iron in wash water. A sourced, step-by-step fix for heavy cotton.

Late August is when it turns up. The sun is still strong at noon, the evening drops to twelve degrees, and a hoodie goes on over shoulders and a neck that took a coat of SPF 50 six hours earlier. A week later there are yellow-orange marks inside the hood, along the collar, sometimes across the cuffs.

That mark is not dirt, and scrubbing harder will not shift it. It is mostly an oily residue plus a chemical reaction, and it responds to a specific order of steps.

Why sunscreen turns cotton orange

Many chemical sunscreens use avobenzone as the UVA filter. It is oil soluble, so it soaks into cotton along with the rest of the lotion. A sunscreen stain patent filed by the laundry chemicals maker Ecolab describes the sequence plainly: avobenzone and oxybenzone can leave yellow stains that are difficult to remove, and if the wash water contains iron, the reaction turns them orange. The Belgian textile care company Christeyns says the same in its trade guidance, adding that regions with iron-rich water see more of it. That is why the mark often appears after the first wash rather than the day the sunscreen went on.

Note that the culprit is iron, not hardness. Hard water means calcium and magnesium. Iron is a separate thing, and Health Canada lists staining of laundry and plumbing fixtures among the effects of iron in drinking water. Its current aesthetic objective for total iron is 0.1 mg/L, and the guideline notes that at around 0.3 mg/L people start to see rust staining. Municipal water usually sits under that. Private wells can sit well over it.

Mineral sunscreens use zinc oxide and titanium dioxide instead. They don't contain the ingredient that reacts with iron, but they do leave a pale, greasy film that holds onto body oil. We couldn't find a published test of how that film behaves in heavy cotton over repeated wears, so treat that part as what you'll see, not as settled science.

So there are two things to deal with. An oily film, and a metal reaction. Treat them in that order.

Two rules before you start

  • No chlorine bleach. The Ecolab patent says yellow sunscreen stains appear to be "set" by high pH and chlorine in the wash. It also chews through cotton at the same time.
  • No tumble dryer until the mark is gone. To be straight about it, we found no test showing dryer heat fixes this particular stain. It is common advice for oily stains generally, and a hoodie that dries flat costs you nothing but a day.

The treatment

  1. Lay the hoodie flat with the stain facing up. Slide a folded towel underneath the panel you are working on so nothing bleeds through to the back.
  2. Put washing-up liquid straight onto the mark, about a nickel's worth. It is a degreaser, which is exactly what the film needs. Christeyns' own approach for commercial laundries starts the same way, with surfactants to lift the UV filter out of the textile before anything else. Work it in with a thumb or a soft brush for thirty seconds and leave it fifteen minutes.
  3. Rinse with the coolest water you have. If you're on well water or know your supply runs high in iron, rinse with filtered or bottled water instead. Less iron in the rinse means less to react with.
  4. Still orange? Go acidic, not alkaline. Mix a teaspoon of citric acid into half a litre of cool water and soak the stained area for an hour. That ratio is a kitchen approximation, not a tested dose. The reasoning behind it is in the Ecolab patent, which treats these stains with a solution held below pH 7, using organic acids such as citric acid alongside chelating agents that bind the metal ions. Test an inside seam first.
  5. Rinse clear, then wash at 30C on a gentle cycle with normal detergent. Leave out fabric softener for this wash. It adds nothing to stain removal and you want to see the cloth as it really is.
  6. Dry flat in the shade and check the spot in daylight before it goes anywhere near heat. Repeat from step two if a shadow remains.
If the stain looks fainter after each round, keep going. If two rounds change nothing, look at the water before you blame the method.

A word on oxygen bleach. Sodium percarbonate soaks are the standard advice for most stains, and they are kinder to cotton than chlorine. But percarbonate makes an alkaline solution, and the patent above names high pH as one of the things that sets sunscreen yellow. We couldn't find a test settling whether a home oxygen soak helps or hurts this stain. Until someone runs one, the acid step is the better bet for orange marks.

Oily stains that survive a wash are not a sign of a bad fabric or a bad wash. The textile industry measures this property directly. AATCC TM130, the oily stain release test method, forces a set amount of corn oil into a fabric specimen under a weight, launders it, then rates what's left on a scale from 5 to 1 against a graduated reference. Fabrics are graded on it because some residue after laundering is expected. Salamandra hasn't had its cloth tested to TM130. We mention it to show what the method measures, not to make a claim about our garments.

When the water is the culprit

Iron-heavy water will keep feeding the reaction every wash. If you're on a well, a water test will tell you the iron level, and anything above the 0.1 mg/L objective in the Health Canada guideline is worth knowing about. In the drum, a laundry additive with a chelating agent or sequestrant does the same job Christeyns describes for commercial machines, binding the metal ions so they stay out of the stain. Laundry rust removers are another option, but read the label and keep them for white cloth, because we can't vouch for what they do to dye.

On black and dark cloth

On dark cotton the orange is much harder to see. What usually shows is a pale, chalky film, which is the oily residue and any mineral filter sitting near the surface. The degreaser step usually clears it on its own. Go easy on long soaks of any kind here, and always test on an inside seam. The guide to washing a hoodie without shrinking it covers the cool wash and flat dry that keep dark cloth in shape between treatments.

Stopping it next summer

  • Give sunscreen fifteen minutes to dry down before a hood goes over your neck. Less wet lotion means less soaks into the loops.
  • Check the label. If staining keeps coming back, a formula without avobenzone takes the iron reaction out of the picture, since that is the ingredient both Ecolab and Christeyns point to.
  • Do the neck and ears first, then dress.
  • Rinse the collar under a cold tap the same evening. Thirty seconds beats an hour of soaking in September.
  • Never leave a damp hoodie balled in a bag overnight. Hang it, even if it's going straight in the wash tomorrow.

Heavy cotton takes this kind of treatment well. There is enough fibre in a 480 gsm loopback to survive a few rounds of degreaser and a soak without going thin, which is not true of a light jersey. There's more on what that number means in GSM, explained without the marketing. Wash cool, dry flat, and check before you heat it. The full care routine is on the care page.

Sources

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