Pour all of the ingredients into a large mixing bowl and stir to combine.
2 cups washing soda, 1 cup baking soda, 3/4 cup citric acid, 1/4 cup course Kosher salt
Place the mixture in a quart Mason jar to store.
Notes
Make this detergent in a well-ventilated area. Even though the ingredients are clean, the dust from it can still cause irritation if inhaled.
To use, fill up the prewash and main wash dishwasher compartments completely, and run the dishwasher as usual.
If your dishes appear cloudy, use white vinegar as a rinse aid to remove hard water residue. You can also slightly increase the amount of salt to help soften the water.
If your dishes aren't coming out clean, check to see if your dishwasher filter needs cleaning.