When I do find my skin looking a little bumpy or flaky, this is what I reach for. When I was a teenager The Body Shop used to sell a Viennese Chalk Facial Wash that I loved (you mixed with water to form a thin liquid wash that also gently exfoliated the skin) and Fresh did a similar product with rice powder.
Wish Wash is a white powder that you mix with a little water to form a thin paste, which you then use as a wash on a damp skin. I use this as a double-cleanse/exfoliant step after cleansing my face with my usual cream cleanser; Wish Wash doesn't remove makeup effectively so don't rely on it as a one step cleanser.
What I really like about this: it's very gentle, but effectively deals with annoying clogged pores on my reactive, normal-to-dry skin. The annoying under-the-skin tiny bumps are dealt with within a couple of washes, and I can use Wish Wash every day for a few days without stripping my skin.
Dermalogica Microfoliant works on a similar basis (and you get double the product for the same money with the Dermalogica) but I prefer Wish Wash for the simpler ingredients list and its gentleness on my skin. Wish Wash is £28 for 30g, but you only use a small amount each time.
www.misebeauty.com. It's also available at www.cultbeauty.co.uk and in the US from the brand website www.fixmalibu.com.