Japanese charcoal cleanser
I have tried it a couple of times and it is impressive. I don't think my skin has ever been so clean. Charcoal is extremely efficient at absorbing impurities. In Japan, it is a favorite spa and public bath house product. And it seems to pop up in all sorts of things, such as toothpaste and even cotton buds.
Personally, I would only use the facial cleanser once or twice a week as it is pretty powerful. I should think that for anyone with oily skin and/or a tendency towards enlarged pores would find it extremely effective.
Finding it, unless you get the chance to go to Tokyo and stock up, is tricky. I did find something similar via Amazon, although it is a soap bar rather than liquid cleanser. The link is here.