Charcoal soap and clay masks both get marketed with similar "detoxifying" language, but they work differently and fit different parts of a routine. Charcoal soap is a daily-use cleanser — you are in contact with it for seconds, not minutes, so its main job is lifting surface oil and everyday grime rather than a deep, intensive treatment. Clay masks (bentonite or kaolin are the most common) are left on for five to fifteen minutes, giving the clay time to bind more thoroughly to oil and impurities sitting deeper in the pore, which is why they are usually a once or twice weekly step rather than a daily one. Using both is not redundant: a charcoal bar for daily maintenance, with an occasional clay mask for a deeper weekly reset, is a reasonable combination for oily or congestion-prone skin, particularly through the humid summer months in much of Australia, provided neither is over-used to the point of drying skin out.