Interesting  thoughts, just this morning I had a garage door opener 
remote quit working. All it took was a little solvent to clean it up, 
and it worked again, better than ever range.

Marcel Duchamp wrote:
> Data Point One:
>
> I have a Sony stereo receiver purchased in Japan in 1970.  When I opened 
> it for some repair work, I saw that the main circuit board was 
> completely covered with flux.  Not a little here or there; entirely 
> coated.  Every other audio/video/TV product from that era I ever opened 
> up was also covered in flux.
>
> Yet over 35 years later, they still work as well as new.
>
>
> Data Point Two:
>
> Taking so-called "NASA qualified" soldering classes in college, removal 
> of all flux was absolutely mandatory.  And flux is well known to 
> complicate life if the board was dirty or contaminated before the flux 
> was applied.  It never hurts to have it removed.  Yet, I always wonder 
> about Data Point One.
>   
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