George M. Middius wrote:
> ImStillMags wrote:
>
>> Copper cleaner or silver cleaner does it instantaneously. I guess
>> ketchup would be a good back up if you are out of cleaner.
>
> Ketchup only has a trace of vinegar and citric acid. I'll bet it takes
> at least an hour.

It does take a very long time and isn't nearly as effective as copper
cleaner.