Are blackheads caused by improperly cleansed skin?

Blackheads or comedones are caused by clogged pores, and excessive scrubbing can irritate and further inflame skin. Blackheads often contain dirt, oil, and dry and dead skin cells that need to be removed. Products that help dissolve sebum are the most effective. ~Taken from Skin Inc. mag 5/09 (The reason blackheads are black is because they are oxidized from exposure to the air- good news is no bacteral infection from lack of oxygen).