One nice little problem is that in my installation we have a couple of zombie files. Whenever we try to delete them, some users' clients doesn't want to delete

One nice little problem is that in my installation we have a couple of zombie files. Whenever we try to delete them, some users' clients doesn't want to delete it and reuploads it. Short of resetting and redownloading these clients' sync state, nothing else has worked to resolve this issue.