The very, very, very best treatment for blackheads is, IMO, a carribiner. Slightly painful, but I would say "natural".
For those who don't know, a carribiner (sp?) is a small metal instrument with a loop of metal on each end. You see your esthetician use one during a European facial. (And, you can buy them in Linens 'N' Things - they have all kinds of bathroom tools, nail files, clippers, small mirrors, yada yada up towards the registers).
So, steam your face really well (I like to throw some Swiss Kriss laxative in the hot water, weird, I know, but it does help you to "get rid" of the gunk on your face), then after your pores are open, use a magnifying mirror and the carribiner to press out the blackheads.
It's really easy to figure out the tool. You simply lay it with the rounded end on the "outside" a blackhead and press - usually the whole thing will just pop right out intact. Gross, I know, but it leaves absolutely no scarring or marks if you do it right, and your skin looks really clear with weekly (or, sometimes twice weekly) use. Be forewarned, I find the nose blackheads the MOST painful to get out - just because there isn't as much "give", but it is so worth it.
If you try this - let us know how it works.