Gather your ingredients. Preheat the oven to 350° F (180°C).
In a bowl, combine the baking soda, essential oils, and water. Mix them into a paste.
Spoon the paste into the silicone molds, press the mixture in, and smooth the tops off with your fingers.
Place the pan in the oven and bake the cubes for 20 minutes at 350° F.