Benecos Konjac Sponge with Black Bamboo - for Oily Skin. Benecos Konjac Sponge with Black Bamboo helps to remove dirt, excess oil and bacteria from oily skin. Benecos Facial Konjac Sponge is a cleanser and exfoliator and is the perfect choice for daily cleansing oily skin. The facial sponge can be used on its own or for a deeper cleanse with the addition of a facial cleanser. Vegan.