I purchased this dishwasher at the end of December, 2010 and was immediately dissappointed in it's ability to clean. I would even add water to the unit and that would help some.
Then, a few days ago I read about problems with the fill valve and out of desperation I followed the manufacturer's instructions for putting two cups of vinegar inside the machine and running it with out dishes. I put the vinegar inside a Pyrex measuring cup and put the cup inside the dishwasher wrong side up and ran the Heavy Duty Cycle.
Well, lo and behold the dishwasher started filling with more water. Each cycle fills the unit to just slightly below the heated dry element. This was definitely more water than I had experienced before.
Well, needless to say, this unit now cleans like a car wash!
The dishes come out clean and sanitized, there is no more white residue on the inside of the tub and the dishes are clean.
So, the only thing that I can think of is that this unit was a floor model. Either it had a sticking fill valve or it had been in someone's home and they didn't like the way it cleaned!
In any case, it cleans beautifully now. I use Cascade Rinse aid, though you could also use Jet Dry, but that little vinegar rinse has made all the difference in the world.
I did remove the third level culinary tray, and I don't really miss it. But, the unit now cleans as advertised.
So, if your unit gives you problems, try the vinegar rinse. It is still doesn't fill well, then replace the fill valve.
But, the unit, as I said before, now cleans like a car wash which is why I bought a KitchenAid to begin with!