Large PCB source for dead bug homebrewing?

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[snip]

Cleaning OLD PCB stock the "green" way -

Sprinkle any kind of table salt on the PCB stock, then take
half a lemon and rub it on the salt. Most of the blackened
oxide will disappear!

I've amazed a few people when we go out to eat lunch. I take a
tarnished golden dollar and put it in the lemon from a drink, or catsup
works just as well. Less than a minute later, it's nice and shiny
again. The vinegar or citric acid reduces all that tarnish to
invisible. Some say the carbonic acid in the fizz in cola will do it,
too, but I haven't tried it. Check it out sometime when you're into
impressing your friends.

I tried that late last year on some 4" x 8" double-sided
phenolic substrate PCB stock after seeing all those "green"
site remarks that I didn't really believe. It WORKS!
Those pieces had been sitting in the back of the workshop
for about 35 years.

I did "cheat" a bit. Have a year-round producing lemon
tree and my wife had some coarse salt left over from a
canning experiment. Zero cost trial...lemons at the
markets can run 50 cents each. The residue can easily
wash down the sink, don't need any gloves, nothing toxic.

Just make sure you don't get any of it in a cut on your finger. The
lemon will add a whole 'nother meaning to rubbing salt in your wounds!!

Result is easily solderable although for best appearance,
some cleaning with a bleach-containing kitchen cleanser
will make it shiny and spotless.

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