Tap the stick blender on the bottom of the bowl to get rid of bubbles. Slowly and carefully add the lye solution to the oils. Pulse the stick blender on and off to begin blending the oils and lye together. Continue to pulse the stick blender for 15-20 seconds and use the stick blender to stir the mixture.
Once you start blending, the mixture will begin to look creamy. After about 1 minute of blending and stirring, the oils and lye are combined and the soap will be the texture of thin pudding.
Add the fragrance oil to the soap and use your whisk to combine thoroughly.
At this point, the soap batter will have thickened slightly. Add 1 Tbsp. of exfoliant and whisk to combine.
Once the exfoliant is thoroughly mixed in, slowly and carefully pour the soap into the silicone loaf mold.
Tap the mold firmly on the counter to release bubbles.
Cover and insulate soap to promote gel phase.
Unmold and cut after 3-5 days. Cure for 4-6 weeks before using.