Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Hi there
Ive never tried Lemon Juice however i remember i think from Mr.
Wizard, (remember him?) a good way to clean copper.
Take some white vinegar, (red wine vinegar also works) and mix in
some table salt.

This is your copper cleaner. Drop your board into a shallow tray
with some of this stuff and watch the tarnish vanish. Rinse well with
water. Get it all off or it will just start to corrode later.

This removes tarnish, but won't pollish, A good pencil eraser may be
used to burnish the copper traces.


A little thing to remember, Being vinegar and salt, one would assume
that this is a safe substance, and it is... BUT once you use it to
clean copper, it becomes poison. I just pour some in a tray or on a
paper towel and discard when im done, i never reuse.