Our last deishwasher was a Bosch - it performed extremely well for 10 years - this was during a time when we did a lot of entertaining.  Our initial experience with our new 300 series was not good. The intitial few loads did not turn out clean - glassware cloudy, silverware covered in a whitish powder.  I called the service center and they provided directions on how to increase the rinse aid amount.  I checked the water temp which was at 121F.  We changed soap brands to Finish.  Problems continued.  I increased the water temp to 130F.  I ran a cleaning solution - Affresh - through the dishwasher. After a few more loads, dishes, glassware and silverware were coming out brilliantly clean - no evidence of any residue.  I'm still not sure what was causing the initial problems, but whatever it was the issue seems solved.  We are very pleased with the current performance plus the quiteness of the machine.