In Visual Studio, what does the “Clean” command do?

Question

You know, the one that outputs this=>

------ Clean started: Project: Foo.Bar, Configuration: Debug Any CPU ------
========== Clean: 1 succeeded,

Answer 1

It goes through your output directories and deletes any build related files in them.

I think you can also configure this by going to the Project's properties in

Configuration Properties -> General, under "Extensions to Delete on Clean"