Detergent for the dishwasher is SO expensive. I searched the net for a home-made alternative and developed this simple recipe. We've been using it for a while now and it washes the dishes even better than the shop bought variety. The amount needed will depend on how soft your water is - we find 1 tablespoon is enough, but we're on tank water. You might need 2 tablespoons if you're on hard town water. Instead of Rinse Aid, we just use white vinegar.