Why Does My Raincoat Smell? (And the Shirt Under It)
In the monsoon a raincoat gets stuffed under a bike seat or into a corner the moment you arrive. A week later it smells like a wet dog, and the shirt you wore under it does not smell much better. Both have simple causes.
Why does my raincoat smell?
Usually because it was folded away wet, so mildew grew in the folds; the US EPA says damp materials should be dried within 24–48 hours to prevent mould. An older raincoat that smells sour and feels sticky inside has a polyurethane coating that is breaking down, which no wash can fix. And the shirt underneath smells because a raincoat traps your sweat against it.
ODORSTRIKE 50ml · pocket size
Clothing deodorant: neutralizes sweat, smoke and food smell in the fabric. Never on skin.
Use it when the shirt under your raincoat arrives at office damp with sweat.
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See how ODORSTRIKE worksIn this guide6 sections
Two-wheeler riders in Mumbai, Bengaluru and Kolkata know the routine: arrive soaked, peel off the raincoat, roll it up and push it under the seat or into a corner. It comes out the next morning still damp, and after a week of that it starts to smell.
Why does a raincoat smell musty?
Because it never dries. Rolled up wet, the folds stay damp for days, and mildew grows.
The US Environmental Protection Agency advises drying damp materials within 24 to 48 hours to prevent mould growth. A raincoat rolled up under a bike seat in monsoon humidity can stay wet much longer than that. The smell is the same musty smell as a damp towel, and it gets worse every day the coat stays folded.
Why is my raincoat sticky and sour inside?
The waterproof coating is breaking down.
- Musty, coat still smooth insideDry it open, then wash gently
- Sticky, peeling, sour insideCoating is breaking down: replace it
- Shirt underneath smellsAir it, then refresh the fabric
Many raincoats are nylon or polyester with a polyurethane coating on the inside. Over time, heat and moisture break that coating down through a reaction called hydrolysis, and it turns tacky, peels and gives off a sour, stale smell. Storing a coat damp speeds it up. Once the inside is sticky, washing will not bring it back; the coat will also start to leak. Replace it.
How do you dry a raincoat properly?
Open, hanging, with air on both sides.
- Shake off the water and hang it on a hanger, not a hook, so the shoulders keep their shape.
- Open the zip and pockets. Turn it inside out after the outside has dried.
- Dry it in shade with a fan or a breeze. Avoid heaters and strong sun, which age the coating faster.
- Never fold or bag it until it is completely dry.
How do you wash a raincoat?
Gently, and only as the label says. Most can be hand-washed in cool water with a little mild detergent. Skip fabric softener, which can affect the water repellency, rinse well and hang it to drip dry. If the label says do not wash, wipe the inside with a damp cloth and dry it fully instead.
Why does the shirt under a raincoat smell?
A raincoat keeps rain out and sweat in.
Most raincoats do not breathe, so on a warm monsoon ride your sweat cannot escape. You arrive dry outside and damp inside, and that damp shirt then sits in an air-conditioned office for nine hours. Take the raincoat off as soon as you arrive, let the shirt air for a few minutes, and once it is dry, mist the underarms and upper back with a fabric mist for the shirt that sat under a raincoat. ODORSTRIKE dries in 15–30 seconds, or a little longer in high humidity. Our guide on the two-wheeler commute and office sweat has the full routine.
How should you store a raincoat between monsoons?
Clean, bone dry and loosely hung. Wash or wipe it at the end of the season, dry it completely, and hang it in a cupboard rather than folding it tightly into a plastic bag. Check it once before the next monsoon: musty can be washed; sticky means replace. For clothes that came home damp, see our guide to musty monsoon clothes.
A musty raincoat needs drying and washing; a sticky one needs replacing. A fabric spray is for the clothes you wear under it, not for the coated side of a raincoat.
Sources
US Environmental Protection Agency A brief guide to mold, moisture and your home. EPA. epa.gov
Cascade Designs (MSR) How hydrolysis breaks down polyurethane-coated fabrics. Manufacturer explainer. cascadedesigns.com
Frequently Asked Questions
Can I fix a sticky raincoat?
Not reliably. Stickiness means the coating is breaking down. It will keep getting worse and start to leak.
How do I stop my raincoat smelling?
Never fold it wet. Hang it open to dry as soon as you arrive, and wash it gently when it starts to smell musty.
Why does my shirt smell after wearing a raincoat?
Most raincoats do not breathe, so sweat stays in the shirt. Take the coat off promptly and let the shirt air before you sit down.
Can I put a raincoat in the washing machine?
Only if the label allows it, on a gentle cool cycle without softener. Hand-washing is safer.
ODORSTRIKE — Fabric Odor Mist
50ml pocket spray for clothes. HPβCD traps odor molecules in the fabric and Zinc PCA neutralises them, instead of covering them with perfume. Dries in 15–30 seconds, up to 8 hours of odor protection on fabric under normal office/commute conditions. Fabric only, never skin.
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