Bought this new and have been extremely disappointed in it.  Doesn't clean dishes well at all.  Stuff on the top rack is often speckled with food, especially inside tall glasses.  Top rack doesn't roll easily, even though it's just a few months old.  I have tried every dish detergent under the sun and can not find one that works well in this dishwasher.  Even liquid detergent doesn't rinse fully off the door during a pots and pans cycle.  This dishwasher is only a few months old and I'm wondering if I need to call an appliance repair specialist who can help me troubleshoot why this dishwasher...