Add the baking soda and Epsom salt to a large mixing container. If necessary, place the baking soda into a fine mesh sifter to help get rid of clumps.

Add the pumice, and mix the ingredients together using your hands or a spoon.

Add the lemongrass and fir needle essential oils, and mix to thoroughly combine. Transfer the mixture into the bail jars to store. Before using the scrub, test it on a hidden area in your shower or sink to see if it scratches the surface. The scrub may be a bit too harsh for certain finishes. When you’re ready to use, place the dry scrub directly to a damp shower or sink surface, and use a sponge to scrub away grime. Rinse thoroughly after use.