I've got some ArctiClean that I used for my 212+ installation. Worked fine - though it's a bit expensive. The first bottle smells like citrus...maybe it's just 'goo gone', and the second doesn't really smell like anything, but I bet a high % alcohol would work just as well. I used coffee filters for clean-up, btw.
This really is the best. The citrus smell is because there is some citric acid (orange juice, lemon juice) in the solution which is needed to do two things: (1) bust up and dissolve the thermal paste in a way that IPA can never accomplish (just basic chemistry at work), and (2) dissolves the surface layer of metal oxides that covers all aluminum and copper metals and simultaneously passivates the freshly exposed metal surface with a uniform surface layer of metal-hydride (M-H bonds).
The second bottle is just IPA, with removes the excess chemistry from the first bottle and the alcohol groups (-OH) finalizes the surface passivation.
If you just use IPA to remove existing TIM and reapply new TIM then you have left the pre-existing surface layers of metal oxides which are thermally and electrically insulating by virtue of the same physics, phonon coupling and fermi band-gap.
Its not the end of the world (obviously) but there is a fundamental chemistry/physics based reasoning why cleaning the metal surfaces with a light acid like citric acid (orange/lemon juice) or acetic acid (vinegar) is preferred by professionals in just about any application involving thermal transfer interfaces.
(FWIW copper surfaces respond better to citric acid, aluminum responds better to acetic acid)