Add the baking soda, citric acid and cornstarch to a glass or metal mixing bowl. Whisk until all of the powders are well combined.
Next, add the essential oils and stir well to incorporate, making sure to break up any small clumps.
Add the water and yellow soap colorant to a small mixing bowl, then stir to evenly distribute the color.
Sprinkle the water, 1 teaspoon at a time, over the mixture to slightly dampen it. Stir well to distribute the yellow color.
Transfer to the flower treat mold, pressing down firmly. I like to have a baking sheet or cutting board until silicone molds to make them easier to move around.
After all of the cavities are full, place the silicone mold in the freezer for 2 hours. Gently pop each citrus shower steamer out of its mold and store in an airtight container.
Notes
How To Use Shower Steamers
Place 1-2 citrus shower steamers into the corner of your shower, away from the water. The steam will activate the invigorating citrus vapors.