Remember way back when, I wrote a post about Jabs Homemade Laundry Detergent? Well, I decided to give their dishwasher detergent a go and after using a full batch, I have to say it totally works!
Jabs Homemade Dishwasher Detergent
1/2 cup Borax
1/2 cup Washing Soda
1/4 cup Kosher Salt
1/4 cup Citric Acid
It may clump over time, but that's just the citric acid. No big deal. And use vinegar as a rinse agent. I was leery about that, but it works great. He says to use a tablespoon per load, but I use an old ice tea scoop...about 2 1/2 tablespoons. I'm going to have to try using a tablespoon and I'll let you know how that goes. I use a 1:3 ratio per load...2/3 in the main section and 1/3 in the pre-wash.
A note on Citric Acid...you can buy this stuff online or at a place they sell beer making supplies. I am too lazy to do that. So instead I picked up Lemi-Shine at Target. It was roughly $3 (if I remember correctly) for a 12 oz. container. Some people reported in the comments section on his page that they were getting a white film on their glasses. I haven't had that problem.
The cost savings is astronomical, but more importantly, when you're out of it, it takes too seconds to whip up a batch instead of having to run to the store. This definitely gets my stamp of approval!