Get rid of washing machine odours using vinegar
White Vinegar White distilled vinegar has an array of uses. Try putting half a cup of white (distilled) vinegar inside an empty machine and put it on a boil wash. Note that because the first bit of water goes into the sump hose and is sealed off, I recommend that you wait until the washing machine appliance has been filling for about 15 seconds before pouring the vinegar into the soap drawer where water is running into let it wash down into the machine. I’ve had reports back from people that this does actually work.
What causes washing machine appliances to smell?