Unused attachments at bottom of posts - do they get removed over time?

We've been moving a lot of user generated images over to attachment files, and one of the things we've run into occasionally is if those attachment files get unlisted from the post (user copies and pastes an out of date version of their post from an external document, or they the post history is reverted), those attachments wind up with no reference to the post and they all get dumped at the bottom of the post like this:

Spoiler


In some cases these folks may have hundreds of...

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