If your washer smells bad, it’s likely due to mold or mildew buildup. You can try running a cycle with hot water and vinegar to remove the odor. It’s also important to clean your washer regularly to prevent mold buildup in the first place. To prevent mold buildup in your washer, it’s important to leave the washer door open between cycles to allow air to circulate and avoid leaving wet clothes in the washer for extended periods of time.