Igor,
It is amazing how effective it is. I had to do this once and the
copper sufate really did the trick.

Just make sure wherever you get the copper sulfate gives you directions
on it's use. In general, you pull a few samples of a known quantity of
wine and add differing amounts (in drops) to the samples. It acts
almost immediately, you swirl the sample and the stink goes away. You
don't want to use any more than necessary.

Joe