For those clothes that already smelled like mildew because they were (1) washed in the stinky washer or (2) damp items that weren't washed soon enough (e.g., towels and swimsuits from a day at the pool, sweaty workout clothes thrown into the hamper), I poured 1/4 cup of white vinegar directly into the wash with the load of clothes/towels, etc. That seemed to do the trick to eliminate the smell. And, surprisingly, my clothes did not smell like vinegar.
(NOTE: the vinegar trick also works when you are washing colors that bleed, like reds or you could use those handy SHOUT color catcher sheets, which are a staple at my house.)
Despite the fact that I no longer have a stinky washing machine, I am still dreaming of these ...
In the words of Snow White (which I've seen A LOT of lately), "one day my prince will come".