cleaning hi-z high-z high impedance areas - acetone additive

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.... I find a bamboo skewer perfect for scratching away deposits or blobs of flux , the wood is a little softer than the pcb material ,so does no damage to the undelying surface , I remove as much as I can by scraping first , I then use a qtip moistened with iso to swab the areas , I try to avoid spreading it around , so I wipe with the qtip , rotate it 90 degrees , wipe again , rotate etc .
Its very easy to flood the area with iso ,disolve all the flux and end up with a microthin layer covering the entire board when it all dries out again .
Excellent advice.... If you do make the mistake of flooding the area with iso, it can take a LOT of iso to get rid of that microthin layer....
 

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