Mass Removal Unused Block

Hi!

I recently had my site updated, and one of the plugins the developer used to show my social icons and table of contents was causing an error on my site. After he removed the plug-in, the social icons didn’t appear, but two days ago, they showed up on my post.

Is there any way to mass remove them without going into each post?

The link above is an example of how it looks.

Thanks

The page I need help with: [log in to see the link]