To make mess items on Child server accessible for deletion, you need to remove all these Child Servers from hierarchy node on Parent Server, themn these replicated mess items on Child Servers will be available for manual deletion. After that, when all mess and unnecesary replicated Items will be manually deleted from Child SMP Console, you need to go back to Parent Server and add these Child servers back to return back your Hierarachy structure and replications.
I don't think that you want to use such way, so probably better will be export these mess items on Child Servers and set them:
- IsHierarachyManaged = False
- IsReplicable = False