My father in law put my dishwasher in last week and I am thrilled! (you can read about that here) I've been using Cascade Complete for washing and vinegar for rinsing. I can't believe how sparkly the dishes are! Absolutely no streaks or soap scum thanks to the vinegar. I don't even use Jet Dry!
1. Use LESS dishwasher soap. It doesn't take a lot! Save your $$$$.
2. During the rinse cycle, add 3/4 to 1 cup of vinegar. (Depending on your water, you may be able to use less. Do experiment!)
Do you use vinegar for something unconventional? Please share!