My Miele Optima had a slight odor when it was delivered, and I called Miele customer service for advice. They said to run the Saniwash cycle two times, adding 2 cups of vinegar to the water after it fills for the wash portion of the cycle. You didn't say which model you have, but my instruction book says there is no prewash prior to the main wash, so I added the vinegar after the first fill. They also said never to add bleach. You might give this a try even if it seems that the odor is from the dishes being held for more than a day.

I don't have a Miele, but was just wondering if you are using a rinse function on the d/w, or did you mean you rinsed by hand? Using a rinse cycle, when you aren't running a wash cycle that day, tends to make European d/ws smell. Dirty water gets left in the bottom which soon goes stale.

I do have the Optima and I rinse manually, -I will try the vinegar and run it with the cycle. Thank you for your help!!!!

If you've got oder in your DW, there must be some leftover German river water in there - oh, you meant odor - never mind :-)