My freshly washed bed sheets smelled sour — until an expert pointed out my drying mistake
Infection prevention expert Dr. Shanina C. Knighton explains that sour, urine-like odors in freshly washed sheets are caused by bacteria surviving the wash cycle. These bacteria multiply when bedding is not fully dried, utilizing moisture, warmth, and residual skin oils as a food source. The resulting bacterial breakdown produces ammonia, which creates the persistent unpleasant smell known as permastink.
- ▪Washing removes soil but does not sterilize fabric, allowing a small number of bacteria to survive every cycle.
- ▪Bacteria thrive in damp sheets by feeding on moisture, warmth, darkness, and residues like skin oils and detergent.
- ▪The decomposition of sweat and skin waste by these bacteria releases ammonia, causing an odor similar to urine.
- ▪Common causes of damp sheets include leaving them in the washing machine too long or folding them before they are completely dry.
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| Original publisher | Tom's Guide |
| Canonical URL | https://www.tomsguide.com/mattresses/pillows-bedding/my-freshly-washed-bed-sheets-smelled-sour-until-an-expert-pointed-out-my-drying-mistake |
| Publication time | Wed, 30 Sep 2026 08:30:00 +0000 |
| Retrieval time | 2026-09-30T08:36:56.128Z |
| Last seen | 2026-09-30T08:36:56.128Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
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| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | cgc3lV3SzOVi · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
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| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
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| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
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Mattresses Pillows & Bedding My freshly washed bed sheets smelled sour — until an expert pointed out my drying mistake How To By Nicola Appleton Published 30 September 2026 According to an infection prevention expert, a specific bacteria that makes your bed sheets smell like pee. Here's why, and how to fix it. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. (Image credit: Future / Shutterstock) Copy link Facebook X Reddit Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter There's nothing quite like climbing into bed when your sheets are freshly laundered...
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