recursively deleting files/directories

[drstrip@cs.sandia.gov (David R. Strip)]

Now that I'm finally getting around to loading the 8.1 sources, etc,
I want/need to delete the 8.0 sources. If I do
Delete File >rel8>**>*.*.* :expunge yes
I get rid of all the files, but not the directories. Of course,
if you repeat this n times, where n is the max depth of the 
directory tree you can clean out everything, but I keep thinking
there must be a magical incantation to do the job right in the
first place. I looked around the docs, but can't find anything
that appears to be the right thing. Of course, I might be looking
in the wrong place. Thanks.
Strip