How do I get the foul smell out of my Miele dishwasher!?

I have a Miele G870 dishwasher. The Salt Reservoir is full of water all the time...I do not use Salt in my machine because my water is soft...It has food particles floating in the reservior and it never drains...It has a foul smell coming out of it! I clean the Combination filter, Spray Arm and Drain pump once a week and I still have this foul smell. I have put hot water in the reservior to help with the removal of the particles floating in there but it only last for a day or so.... Please advise! Thanks