Rubbing alcohol contains Glycerin: a colorless, odorless, syrupy, sweet liquid, C3H8O3, usually obtained by the saponification of natural fats and oils: used for sweetening and preserving food, in the manufacture of cosmetics, perfumes, inks, and certain glues and cements, as a solvent and automobile antifreeze, and in medicine in suppositories and skin emollients.
For a super clean removal of anything
when using alcohol always
use straight Isopropyl alcohol (nothing added except denaturing chemicals, which make ya' sick if ya' drink the stuff, but everything evaporates, whereas glycerin doesn't!) ... I use Humco Labs available in most drug stores. I bought a pint 12-13 years ago and have used it for cleaning CPU's and HSF's many, many times since.