How do I purge pip intsall --user packages?

[Martin Schöön]

I have installed a bunch of packages using pip install --user and
I went for a non-standard location for the install. Now I regret
this and would like to wipe this and start all over again using
the standard location. Is it enough to delete the folder I
specified or am I missing something? Having to uninstall each
and every package would be tedious...

/Martin