
Musty towel odors are typically caused by residue from detergent and fabric softener, which traps bacteria and moisture in the fibers[4][5]. You can diagnose this if towels feel stiff, lack absorbency, or smell sour even after washing[5]. To reset them, run a hot cycle with one cup of white vinegar and no detergent, then follow with a second hot cycle using half a cup of baking soda[5].
Prevent future odors by using less detergent, skipping fabric softener, and ensuring towels are fully dry before storage[4][5]. Always hang towels spread out on bars to improve airflow[5].
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