| The rubbery stuff may be conformal coating.  I had to use that stuff 
when I worked in the Motorola factory when Ford wanted their CB radios 
to be gunked up with this stuff. 
Steve WA9JML
On 7/17/2017 8:22 PM, Bwana Bob wrote:
 Yuk! I've seen brown crud on the foil side of the circuit boards  my 
Paragon and another one that I worked on. In those cases the crud was 
excess soldering flux. I cleaned it off with isopropyl alcohol and 
cotton swabs.  The white stuff may be some kind of oxidation or 
corrosion.  Mold would be black.
73,
Bob WB2VUF
 
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