Greenie? Do you mean fan or thermal pad or heatsinks?
Fan: Attached by 2 pins. Pinch each one together on the back of the card and the pins will come right out.
Thermal Pad: Scrape as much off as you can with a credit card or some other plastic thing, and then soak in nail polish remover (not the whole card...just alittle where the thermal pad is still sticking to the GPU). Then clean off with a lint-free cloth, using rubbing alcohol to get rid of the nail polish remover residue.
heatsinks: Well, I have heard you can place the card inside the staticbag it came in and put it inside a refrigerator for a few minutes, then pop them off easily with a screwdriver. I haven't had the need for this one yet, so I can't tell you if that works at all.