My 6 year old Bosch was leaving the dishes grainy, murky and stained. The flatware was also dull gray. I had a service technician come twice to no avail. Finally I started trouble-shooting myself and discovered that under the door gasket was a pile of filthy food residue that had been gathering for years. I scraped it out and washed all the gaskets and surfaces around the gaskets. I found the filters were coated with a greasy residue and got them cleaned up. Next I ran the dishwasher without soap and found the machine was filled with suds. No wonder my dishes were coated. I ran the machine through 10 cycles (without soap) before the suds were gone. The tech had warned me about my detergent: Cascade with the grease fighting power of Dawn, but I wanted to use it up. I threw it away and went back to a regular strength gel. I only use two teaspoons and my dishes have brightened again and are not longer coated.