Homebrew_PCBs

Another product I've found very useful in cleaning bare copper PCBs is
"Bar Keepers Friend" It's middling abrasive with a bit of oxalic acid.
It will made stained copper bright without much 'elbow grease' You'll
need to wash with detergent afterwards.

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Rich Osman; POB 93167; Southlake, TX 76092 (Near DFW Airport)