Why do my towels still smell musty right after washing?

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   Using white vinegar during the rinse cycle
2. 2
   Running a hot water cycle with a washing machine cleaner or bleach
3. 3
   Soaking in cold water with higher concentrations of enzyme cleaner
4. 4
   Soaking in an enzyme cleaner like Febu or Biz
5. 5
   Soaking in soap and vinegar
6. 6
   Using citric acid in the rinse cycle
7. 7
   Bleaching the period underwear despite potential damage
8. 8
   Soaking in OxyClean then washing with detergent and another dose of OxyClean
9. 9
   Soaking in a covered container of hydrogen peroxide, rewashing, and line drying
10. 10
    Throwing the items away
11. 11
    running several cleaning cycles
12. 12
    installed a backflow or check valve to prevent odors from coming back up through the drain

In their words

Unedited, most upvoted first, each linked to the thread it came from.