In a glass bowl, combine the baking soda, borax, and optional Epsom or kosher salt. Slowly add the vinegar—fizzing is normal—until the mixture is a thick and almost crumbly consistency. Add the essential oils, combining them well. Push the mixture into ice cube trays, and allow it to dry thoroughly for at least 24 hours—outside in the sun works the best. When the cubes, or tablets, are thoroughly dry (they should be hard but crumbly), remove them from the tray and store them in a glass jar with a secure lid. Place one in the soap dispenser of your dishwasher. If you notice a powdery substance
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