My dishwasher (GE Potscrubber 700) is constantly leaving small grains of assorted gunk on my glasses, mugs, etc. Anything that is on the top rack is not safe from this mess. Its not old powder or soap. It looks like small particles of sewage. Is this a possible drain problem? We pulled out what we could from the accessible part of the drain. This model features the wand that telescopes upward to the top rack. Does anyone have any suggestion that will help me be able to use it once again? Its that horrible, we stopped using it. Thanks so much, robynne