public void Clean()
{
// get a list of existing packages at time of calling. It is vital that new packages not be created
// while clean running, they will be cleaned up as they are not on this list
IEnumerable <string> existingPackageIds = _indexReader.GetAllPackageIds();
this.LockPasses = 0;
this.Clean_Internal(_settings.RepositoryPath, existingPackageIds, false);
}