Recipe for Dishwashing Detergent

Laundry detergent is one of my favorite things to make.  It's easy and I always have a 5 gallon batch of it in the garage just waiting for me.  I love it because:
1.  I know what's in it
2.  No more heavy jugs to carry from the grocery store
3.  It saves me tons of money

Recently I found that two of the ingredients I use in my laundry detergent can also be used in making dishwasher detergent.  Another heavy jug crossed off my list!!!  This one is even easier to make.  I just made a batch.  I'll give you the recipe, and you can tell me how you like it.

1 cup borax
1 cup washing soda (not baking soda)
1/2 cup citric acid (amazon.com sells this the cheapest, but you can also purchase it at wine making shops)
1/2 cup kosher salt

Mix it all together and keep in a can under your sink.  Make sure you label it.
Use 1 tbsp.  for each load of dishes.

For a rinse agent, pour white vinegar into your "rinse aid" compartment.  Please leave me a comment to let me know how much you love this recipe.