Laundry left wet in a washing machine can develop a strong smell by the next day, often worse than when it was first washed. Textile scientists explain that moisture and warmth encourage microorganisms to grow on fabrics and trapped residues, producing odor compounds that cling to the material.
Both outlets describe the practical outcome: the easiest remedy is to wash the load again rather than trying to mask the odor. The odor forms as the laundry sits, so simply drying it later may not remove the underlying buildup. The explanation ties the problem to biological activity in damp textiles, which can continue until the garments are properly cleaned and dried.
While the sources share the same core message, their emphasis differs. Phys.org focuses more on the scientific mechanism for why the smell intensifies after the laundry stays wet, while The Conversation concentrates on what people should do in response—typically washing again—when the issue occurs after being forgotten overnight.
