How do you typically Clean flux from PCB

[Silver Blues]

Historically I never bothered cleaning boards but recently I started doing so with DIY-ed IPA/heptane cleaner - really works (the heptane helps to better dissolve the more nonpolar flux relative to straight IPA).

 

[swelchy]

old soft toothbrush and 99.9% IPA in a spray gun wash down bottle... that way I can flood the area down after scrubbing.... then I fling it around to try to dry and chant please work please work...