Product review (1 stars): My Frigidaire dishwasher performed poorly. One of the reasons ...
My Frigidaire dishwasher performed poorly.  One of the reasons is a design flaw of the way the upper rack spray arm attaches to the back of the wall.  There is only a hole in the back wall for the water to enter the spray arm, which has a plastic circle that nudges up against the hole in the wall.  Hot water caused this plastic to warp, and since there is no nozzle that goes into the spray wand, water just runs down the wall instead of into the spray arm.  I bought another brand of dishwasher after only a year or two of putting up with the Frigidaire.