Sometimes i read and dont even remember what i read, lol. I was thinking of thermal paste but the original question was how to get rid of thermal tape (thermal pad).
I use an old or expired credit card or anything similar to get most of it off. Then I use the alcohol. With a very stubborn one i use acetone or other oil based cleaner, but i cant remember doing that in a long time, usually the credit card and alcohol will work.
Another small hint for applying thermal paste. I took a few old playing cards and cut them into thin pieces. The pieces are different sizes for different jobs. For a cpu i use a thin piece, makes it easy to put a thin film on the cpu even when its in the case. I find with the different size pieces i have cut up i dont need any other applicators and the price was right too!
Good advice + great people = tek-tips