How to delete orphan attachments?

I’ve been given the directive to “retire” about 1000 articles from a wordpress site I maintain. Deleting the posts from the DB is trivial, but how would one go about deleting the orphaned files from the uploads folder?

Try plugin called ‘Media Cleaner’. It’s seriously made (the author, tigroumeow, mention 5+ time “do a backup before use”) + upload Janitor was last time updated 10 years ago.