Replaced upper spray arm and bearing, and lower spray arm bearings, which showed visible signs of wear. It is suspected that this wear of the bearings, produced water leakage past the bearing surfaces. This leakage left less water available to both spray arm nozzles, which circulate water around the dishes. Dishes now come out of the machine clean and clear. Also, another big factor, I was using excessive amounts of detergent in the machine. Discovered this when I read the instructions in the manual, which I had not done in quite a few years. When all else fails, read the instructions..
I am 88 years old.