How to find out which data pump jobs are safe to remove

I was running data pump full export and gotten an error:

ORA-31634: job already exists
ORA-31664: unable to construct unique job name when defaulted

I cheked the table dba_datapump_jobs and it has 99 jobs in there, so that's why my export is failing. I need to cleanup orphaned datapump jobs as per document: How To Cleanup Orphaned DataPump Jobs In DBA_DATAPUMP_JOBS ? (Doc ID 336014.1)

In my case all the jobs shown as NOT RUNNING and my query

SQL> SELECT o.status, o.object_id, o.object_type,
       o.owner||'.'||object_name "OWNER.OBJECT"
  FROM dba_objects o, dba_datapump_jobs j