Around the same time I started making laundry soap I also tried to make my own Cascade. I failed miserably. It didn't clean all of my dishes and it left a weird film on them.
I recently did some research about that and discovered that adding salt to the main recipe helps. Odd, I know....but I tried it - and it WORKED!
Dishing washing detergent
1 cup borax (NOT boric acid, they are completely different)
1 cup baking soda
1/4 cup table salt (the cheap stuff, nothing fancy)
Mix it all in a container with a lid. I use 2 tablespoons, which doesn't quite fill up the closed container....and then I add just a little bit to the open cup.
I guess I should say that I do rinse my dishes off before putting them in the dishwasher. I don't know how well this would clean off stuck on foods.
If you try this yourself, let me know how it works for you.