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Does UV light kill bacteria on clothes?

Sunlight can reduce some microbes on fabric surfaces, but line-drying is not a guaranteed sterilisation step.

What UV can do on laundry

UVB and UVC bands (UVC is mostly blocked by the atmosphere) are known to damage DNA in many bacteria and some viruses when dose, humidity, and exposure time align. Dry, sun-exposed fabric surfaces can see a meaningful drop in some countable microbes compared with shade - especially on outer layers that receive direct sun for hours.

Thickness matters: UV penetrates thin cotton poorly and hardly reaches the inside of folded towels or jean seams. Cloud cover, low winter sun, and short drying windows (typical UK days) all reduce effective dose.

What it doesn't replace

Washing with detergent and heat (where fabric care allows) remains the main hygiene step for most households. Sun exposure is a bonus, not a substitute for cleaning soiled items, underwear, or anything needing medical-grade disinfection. If someone is ill, follow care-label temperatures and NHS guidance rather than relying on the line alone.

Practical takeaway

Line-drying in bright, direct sun can contribute to lower bacterial counts on sunlit surfaces, alongside desiccation (drying itself stresses many microbes). Treat it as a helpful extra - especially for sheets and line-airing after a wash - not a lab-grade sanitiser.

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