[TenTec] Slightly off subject

[Stuart Rohre]

Ethyl Alcohol will clean up circuit boards safely.  You need to get one 
of the brushes called "Acid brushes" which have a metal handle holding 
bristles.  Cut the bristles to only 1/4 inch from the ferrule, straight 
across, to make the brush stiffer.  Dip brush into alcohol and transfer 
to board and gradually scrape off the green crud.

This may be a sign of someone using acid core solder, or storing circuit 
board in a damp environment.  On solder side of board, you may try 
pre-brushing with a brass bristle brush, to loosen the green crud.

Good Luck!
Stuart Rohre
K5KVH