We purchased a Samsung dishwasher towards the end of March and now we are having to replace it. I noticed immediately that the wheels on the bottom rack were a problem - they kept coming off, making the rack bottom out and jump off track when sliding it back in. After about two or three months use it seemed the dishes were not getting clean, leaving a grain like residue on the dishes. First thing I did was swap to Cascade thinking the generic brand was causing this, but that was not the problem. I was practically washing the dishes before I put them in the dishwasher by now. Then I tried to clean...