As RW publisher does not remove anything from server you do need FTP client to remove old content. If you are unsure what to remove and it does not bother site owner you can always just delete everything related RW project and Re-publish all via RW with proper robots.txt to say Google what pages to index. Other part will be ‘removing’ indexed pages with Webmastertools. I say ‘removing’ because it’s not that straight forward as Google is saying that some cases it’s matter of letting indexed page fade into oblivion by time.
Anyway, I had to remove some old ‘pages’ recently. Site had gone trough few iterations and some pages that had go trough indexing was no more relevant. As they simply didn’t exist any more there was no need for redirects for saving SEO juice (some one correct me if I am wrong).
Simply Google your URL and check search results for your site URL’s that are no longer valid.
Here’s few helpful tips:
Which URL’s should I use for removal/block?
How to remove an indexed webpage from Google?
Hope these helps