"Clean your washing machine. It will run more efficiently and have less bacteria when you do. People skip this because, 'Oh, it's a washing machine, it cleans every time I do laundry!' but that's not the case. One part vinegar to one part water (however much you want, so three cups vinegar, three cups water, whatever) and a good sprinkling of baking soda, scrub the whole inside of your machine with a washcloth, let it sit, then run the machine empty on the hottest water setting, and VOILA! Clean, happy machine." —blueribbs84
"Newer machines often have a cleaning cycle and you can get those Affresh tablets to toss in." —naraniel
"No need for homemade recipes. Just throw in those washer tablets and run a cycle on the hottest setting. Does the trick every time. It keeps the machine clean and smelling fresh." —mupke
Get a six-pack of Affresh Washing Machine Cleaner Tablets from Amazon for $11.98.