A washing machine is a facility of modern housewife.  These following tips help you eliminate smelly odor from the washing machine which are very easy and cheap price.
Pour a bottle of vinegar and begin a wash cycle without any detergent.  Then let the machine complete a whole process.  If it is still smelly, run a plain water cycle again and the washing machine will be neutralized.
Another useful instruction is after washing clothes every time, you should always open its door to let odor and heat in the machine flow out quickly.  Wipe its rubber door gasket clean to air dry immediately to prevent mildew.  Moreover, for front door washing machine, you should often clean detergent box as well as filter to keep your washing machine good smell.