Cleaning up after OctoPack

We noticed that our build folders on our TFS build server are growing, and we see that all our historical nupkg files which were created by OctoPack are still there, taking up space. Is there a way to have OctoPack delete its packages after they have been pushed to the Octopus server? Alternatively, can OctoPack output its packages to the artifacts directory, which is deleted, and recreated with every build?

Never mind - I was able to solve this using the Build.Clean: binary variable in TFS build.