Thank you, I will definitely watch this. We have tried pre-wash detergent, tabs, liquid soap, powder detergents, in various combinations.

There may be something unusual wrong with our dishwasher. Although we clean its filter regularly, sometimes a kind of brown slime forms along the walls and around the filter, and I have to give it a deeper cleaning. Bosch had no idea what this was! I'm curious if anyone else has experienced something like that.