Have GE model GSD3230ZZ3WW built-in d-washer and I don't think it has ever been cleaned. It leaves a white residue on all our dishes that is difficult to remove by hand. We got our water softner working to help with the hard water problem. We have tried everything, but cleaning the insides out. Besides for running vinegar through a couple of times, is there any parts we should take apart to clean, such as filters or such??