A bad smell from inside

A lot of machines can suffer from this problem. It is usually down to a bacteria build up between the drum and the tub.The majority of appliances that suffer form this have been used mainly on 40 degree washes and with a biological detergent.
The best way to get rid of this smell is to place two tablespoons of washing soda or soda crystals in the detergent drawer and then run the appliance empty on the 90 degree wash. You may have to repeat this treatment several times before the smell goes but it will go eventually.