I've got a Kenmore Ultawash dishwasher that I'm having problems with. It's about 5 years old, and until recently worked fine. Now whenever I use it the dishes, especially glasses come out dirty, with flecks of stuff glued all over them. I've been practically pre-washing the dishes before I put them in. I've cleaned out the inside of the dishwasher and don't see any unusual dirt. Is there a trap somewhere I need to clean out? Help!