My down stairs was starting to smell funny. OK, not starting too, it DID smell funny. I could tell it was coming from the laundry room, but I wasn't entirely sure what was causing the smell. Yesterday I cleaned that room out. Threw out a lot of stuff and organized the rest, but found nothing that was causing the smell. The floor was dry and there was nothing dead hiding behind the machine.
While I was cleaning, I had some laundry going in the machine. When it was time to switch, I opened the washing machine up and WHEW! The smell make me cough. Thanks to Google, I have taken care of my stinky machine.
I ran the machine again, empty of clothes and put in about six cups of bleach. The next load of laundry I did, I added several cups of vinegar. Today the smell is gone and I can sit in the downstairs area without coughing.
Humidity, got to love it! Thanks eHow.com!