Here are ALL the things I tried, many of which worked temporarily, and what finally worked permanently: 1. cleaning the filters (back then I had to use ammonia and Dawn; rinsing didn't work) 2. dishwasher cleaning product 3. vinegar in bottom of DW before starting 4. adding bracket to secure high loop to back wall under sink 5. hiring someone to reinstall the DW (who found that the original plumber hadn't followed the installation instructions; he hadn't used the loop bracket on the side of the DW at all) 6. totally replacing the drain hose twice, which was filled with rotting gunk (worked for 6 months) 7. turning our Rinnai up to 140 degrees F. and being sure I ran the faucet til the water was hot, before starting DW. 8. citrus cleaner soaking in filter cup overnight before running dishwasher 9. cleaning disposal with a special cleaner regularly 10. wiping dishes clean of all debris before loading 11. buying the old type of DW detergent WITH phosphates on the internet (called Boil-Out - it's Cascade's...