To remove the previous compound from a CPU, you will need multiple Q-Tips, and some rubbing alcohol
Damn you! I was gonna suggest that! Nah, I use the same thing though works great. I would be more terrified of the razorblade. I just lapped a heatsink the other day. It was the coolermaster jet heatsink...man...they did a HORRIBLE job on the surface because after polishing it down and everything you could see the center still had original machine grooves in it. BUT.....I got the premium heatsink kit from www.easypckits.com
and have an SLK-900A on the way and will lap that puppy mirror style! Demalli on these forums said he noticed a 4degree drop in his CPU temp and he didn't even use the two most finest grits in the set. he only went to 20 micron and theres also 15 and 10 available plus the 10,000 grit polish! The one by swiftech with the helicoid shape 'screws' coming off it...they exclaim to have a lapping job of .003" (3/10 of 1/1000") and the base looked smooooooth. So I'm gonna lap that beast, plus I got AS5 for it, plus a tornado or maybe the coolermaster blower on the heatsink haven't decided...cause the tornado on the rear as intake blowing into a blower drum seems like it'd be really efficient.
Back to subject: hehe yeah q-tip and some 99% iso will do you good. atleast 90% IMO but some people say you can get by with 70%.....maybe I just like the fumes.... :P