Homemade Dishwasher Detergent Tabs
Ingredients:

2 cups washing soda or baking soda
2 cups borax
1/2 cup coarse salt or epsom salt
1/2 cup vinegar
15-20 drops of lemon essential oil

Mix all the ingredients together with a spoon. (The addition of the vinegar will cause a little fizzing, but not much.) Once all the ingredients are well combined, you will notice it actually will start clumping all by itself.

Transfer the mixture into a couple of ice cube trays and press down until each compartment is hard packed with detergent.

Put them in a dry, sunny spot and let them sit for at least 24 hours.

When they are good and hard and DRY, remove them from the trays and store them in a container with a tight-fitting lid.