Loose dirt and a lot of watter won't drain when cycle completed

One possible solution to your problem could be as follows... Could have been little regular soap or something put in that made it suds up causing it not to drain. Pouring vegetable oil into the dish washer tub will remove the suds. After running vegetable oil for about 5 minutes, pour 2 cups of vinegar in to the tub and run it on the hottest longest cycle with no dishes in it. This will clean the residue out and what ever "gunk" may be in the internal parts. Use Only powder detergent. No gel and No tabs. These 2 cause a build-up over a period of time of use and reduce the performance of your machine especially in a Bosch. This should take care of your problem.