All my non-freshly washed clothes have this horrid musty smell to them, and it's hard to get it out as well. I wash in Woolite Dark and Downy Fragrance free I wanted to be darn sure to get the smell out, so I put the offending towels in my kitchen sink (my bathtub drains slowly even when plugged, so I... It smells like really musty water, but the water itself does not smell or taste bad at all. One more thing it could be is the overflow drain. Depending on the design of sink, the overflow can hold a small

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