A foul, musty odor coming from your washing machine usually means mold or mildew has taken hold, especially in front-load models. The solution? Regular deep cleaning. Run a hot cycle with either two cups of white vinegar or a cup of bleach (never mix them!) with no laundry inside. Be sure to pull back and thoroughly wipe down the rubber door gasket, as this is a prime spot for buildup. Always leave the door ajar after a cycle to allow the drum to dry completely.