In that case, it works by reducing the amount of acne-causing bacteria and by causing skin to dry out, and peel. Part of this is what Dr Adel is aiming for when prepping pits for stinkless summers.
So there's no need to wash hard or long. Think of washing as prep for your acne meds, nothing more. And sorry guys, no more using your pit soap all over your face or anywhere you have acne.