I have been using this mask once a week for about 6 months now, and I love it! Blackheads gone, and I can actually tell my pores are smaller. My skin is extremely sensitive and prone to breakouts with harsh products (I can't even use 1% benzoil peroxide or salycilic acid). I use this once a week in combination with a micro-exfoliator (from Ren) twice a week -- and my skin is clear!
To test it out, I stopped using it for a few weeks, and could definitely tell the difference with blackheads and some pimples, ugh. Will not be skipping this again!
I slap it on generously over my face, neck and decollete after my shower while still damp, get the rest of myself dry and moisturized. By that time it is dry and ready to rinse off. Easy!