"How do I remove the glue off the heatsing on my geforce 2?"
A belt sander should do the trick. Ask at your local hardware store.
Seriously, if you meant to get the sink off then those guys have the idea. If you meant what you asked, how to get the GLUE off the SINK (you didn't ask how to get the sink off the chip) then a bit of find sandpaper may well be in order. Carefully scrape/chip off what you can with fingernails or other non metalic pieces, and yes the freezer trick helps here too, though I never found it necessary. Then sand off the rest. Do a search for "heatsink lapping" to get an idea of the best way to do it.
--Mc