>I didn't think you needed to remove rosin flux either, except for
>special cases...  (rosin: the original no-clean flux for electronics.)

It still absorbs water to some degree, and as such can make lowish
resistance paths where you don't want them.

>Isopropyl alcohol dissolves rosin just fine.  Used to use rosin
>dissolved in rubbing alcohol as a "grip enhancer/hand toughener...

I find it makes a gooey mess. There are better means of washing it off, but
it seems they are not considered environmentally friendly.

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