Most d/w problems (washability) are easy to fix. I feel you're not getting enough water. The level should be close to the heater(check your tech sheet to be sure). The water temp should be at least 140 deg.F (no matter what the box says) Also, use a good brand of detergent (Cascade) and be sure your wetting Agent dispenser is full. (jet dry)You should not have to pre-wash your dishes..just scrape them well.The detergent actually needs some dirty dishes to work properly..fats, protien, etc. to make up 1 more chemical for the detergent.Another important step is to run the hot water faucet before running your d/w to "purge" the cold water out of the line.Good Luck and let me know what you find..wrench:)