Dishwasher is not cleaning like it used to
My dishwasher is not cleaning like it used to. It is only 2 years old. About 6 months ago I noticed that the dishes were coming out spotted and sometimes still dirty. Up until then the dishwasher was great. The repairman has been out twice but says he can find nothing wrong? He thinks that I am a crazy clean freak. Have any of the cooks out there had similar issues? Please help me prove that I am not crazy.