In a medium bowl, combine baking soda, salt, clay, rosehip seed oil, lavender essential oil and peppermint essential oil. Add citric acid and mix well.
Pour Isopropyl alcohol into a spray bottle. Spritz the alcohol onto the baking soda mixture 5 - 10 times, stirring well after each spritz. Add more alcohol as needed to get a consistency that starts to form together, without getting damp.
Add mixture into a bath bomb mold or a meat baller and allow to sit for 10 minutes. Gently remove from mold and place on parchment paper to dry.