“It’s easy to determine the type
of contamination you have on the board. Test
each patch of residue with drops
of water or alcohol (IPA). If the drops of water
dissolve the residue, its ionic;
if dissolved by the alcohol, the residue is organic.
This quickly tells you what it
will take to clean the board (either a water-based
cleaner or a solvent-based
cleaner), and can give you some indication of what
is causing the problem. In both
cases, it’s more likely to be improper techniques or incomplete
cleaning that causes the contamination problem.”
Source: http://tayloredge.com/reference/Science/solder_cleaning.pdf
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