You can read a little bit about how Cumberbatch is still learning how to pretend he's doing magic stuff in the link above, and you can see some more shots of him in the costume at this link. (news.avclub.com)
That means that the Paula's Choice exfoliants don't work like a scrub, but they remove dead skin cells and do all the other magic stuff with the help of acids. (clothesandcamera.com)