Best way to clean copper

[BMyers]

What is the best way to clean copper for silver soldier ? I suppose I could use steel wool or emery but I would prefer a solution for soaking

 

[PTsideshow]

Check the silver solder thread and the pickling solutions thread as it is all covered in those two! no point in typing the same thing over again.
:big:

 

[Bill S]

Lightly oxidized copper -reddish brown colored- doesn't need much, light sandpaper or scuffy pad would do just fine. Any of the fluxes for soldering will also clean light oxidation. Heavy oxidation -green colored- needs more work. Wire wheel or a flapper wheel will work. Muriatic or phosphoric acids will also do the job, but you want to solder soon after as you can after cleaning.

Bill