I read on another website that people were trying white vinegar, althou normal vinegar should work, or bicarb of soda, about a teaspoon full on a hot wash?
Try Smelly Washer. It's an eco friendly product that takes bad odors out of your washing machine. Smellywasher.com
I took one of those "Mr. Clean Magic Erasers" inside of mine and it just took the smell right away. it was awesome =]
OK, so I'm 1/2 way there. So far, I've used these different products with the following results: Bleach
Run a load of laundry. It might help to use a detergent with "color safe bleach" or run a load of whites with real chlorine bleach.
There's a product called Smelly Washer that should do the trick. It takes out the smell washing machines start to get after a lot of use.
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