How to Use Activated Charcoal Soap Wet the skin thoroughly. Work the soap into a rich lather. Massage gently over the skin. Rinse with lukewarm water. Follow with moisturizer if needed. Final Thoughts Activated charcoal soap offers a refreshing cleansing experience and has become a favorite among those seeking a cleaner-feeling complexion. Combined with premium botanical ingredients, it can become an essential part of a luxury skincare ritual.