Delete rman backups

I'm trying to delete old backups from disk using the rman delete obsolete command.

I have  CONFIGURE RETENTION POLICY TO REDUNDANCY 7;

set for the default in RMAN.

I have backups on disk since Oct 22, 2010, several months!

So I ran delete obsolete recovery window of 7 days;  when connect to the rman catalog and the target database.  But it did not delete anything.  I thought maybe the backup had not run thru 7 cycles of backups, but I also thought by running the delete obsolete recovery window of 7 days, that it would delete everything over 7 days old.  How do I delete these files using rman?  I suppose I could just manually delete them and then run a crosscheck, but I thought there would be a better way.