Murad Blackhead & Pore Clearing Duo. Murad Blackhead and Pore Clearing Duo reduces the formation of blackheads by an average of 58%. It s a fast-acting, 2-step treatment which helps reduce blackheads and seal pores for the ultimate protection against pore-clogging impurities. With Volcanic Mineral Clay and Shikakai Extract to detoxify, drawing out dirt and excess oil, to purify pores.