stgit: cleaning up after using git branch delete commands

I've used git commands to delete several branches that had stgit
active on it.  Doing that has left a bunch of clutter in the .git
directory. Is there a stgit command to remove all the clutter from
branches that no longer exist? I'd like to use the branch names again
but the clutter is interfering.

-- 
Jon Smirl
jonsmirl@gmail.com