My Amana sofsound dishwasher is not cleaning the dishes

SOURCE: amana dishwasher not cleaning

make sure water valve is good and you are getting hot water to your d/w run sink in kitchen to get water hot before running d/w

SOURCE: black residue

The black residue is possibly rust from iron pipes. I have an old house with iron pipes and when the washer opened the valve that lets water in from the supply hose it did so suddenly and created a "water hammer" that shook the pipe. The hose supplied with the washer became clogged with this black rust material and needed to be replaced. I replaced it with a different type that did not have a spill proof valve and added an "air cushion". An air cushion is a short 6" vertical pipe teed before the valve. It fills with air bubbles and cushions the shock of that valve turning on thus stopping the pipes from shaking and the loosing of interior pipe corrosion. If the black residue is hard and gritty it is rust not rubber. Wipe the inside of the washer clean of it. Disconnect the supply line and fill a five gallon bucket with it. If rust is coming from the inlet you will see it in the bucket. If you don't have a shut off valve at the washer you'll want to put one on now as turning off the main releases quite a lot of material from the pipes as they drain.

SOURCE: Sandy grit left on dishes.

Our Kenmore was doing the same thing, whereas the water temperature was too low....Someone turned down our dial on the water-heater. Turned it up and now all is fine.....