Hi RHB
A few suggestions downloaded from the net:
Get rid of washing machine smells:
To try and clean the washing machine inside, try using Soda crystals which dissolve grease. I recommend putting half a packet inside the drum and washing on a boil wash (or follow instructions on the packet) Using this method every month or so, or using ordinary detergent if no soda crystals are available can help prevent smells from your washing machine. If your washing machine is badly affected by grease and slime, it may be very difficult to remove it.
Get rid of washing machine odours using vinegar:
White distilled vinegar has an array of uses. For bad washing machine smells, try putting half a cup of white vinegar inside an empty machine and put it on a boil wash. Because the first bit of water goes into the sump hose and is sealed off, I recommend that you wait until the washing machine has been filling for about 30 seconds and then pour the vinegar into the soap drawer to let it wash down into the machine.
Hope these help!