How to delete default privileges

[Francisco Reyes <lists@xxxxxxxxxxx>]

I have a DB where we changed ownership of all objects.

We had:

ALTER DEFAULT PRIVILEGES FOR ROLE old_dbowner GRANT SELECT ON tables    
TO dbgroup_ro_group;
ALTER DEFAULT PRIVILEGES FOR ROLE old_dbowner GRANT SELECT ON sequences 
TO dbgroup_ro_group;

ALTER DEFAULT PRIVILEGES FOR ROLE old_dbowner GRANT SELECT, UPDATE, 
DELETE, INSERT ON tables    TO dbgroup_rw_group;
ALTER DEFAULT PRIVILEGES FOR ROLE old_dbowner GRANT SELECT, 
USAGE                  ON sequences TO dbgroup_rw_group;
ALTER DEFAULT PRIVILEGES FOR ROLE old_dbowner GRANT 
EXECUTE                        ON functions TO dbgroup_rw_group;


But now there is a new DB owner and I have run the above, but with 
new_dbowner. How can I delete the old default grants? Can't find 
examples and don't see it on the documentation either.


Any help would be greatly appreciated.



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