Not that I'm one of those enviormental earthy types but this stuff works very good. I personaly had my doubts about it because from experience, just about everything that is " so-called-green" doesn't work for s**t.
http://www.stardustabsorbent.com/starpower.html
Non toxic and it will even peal dried spray paint off concrete, I use it on just about everything including a 1/2" of 20 yr old dried crusty oil on an engine block. It will even pull the grease stains out of that new pair of jeans the wife nagged at you not to wear in the garage without wrecking them.