Ok, sorry for that.
Unless your site needs huge optimization because it's very, very visited, your issue is a non-issue. I mean, at all. Sites you visit everyday make you load way more unused stuff.
And let's put it that way: if you work for such an important site, your use of Webflow should be limited on prototyping. Webflow does an amazing work but it's not meant to be "a tool to produce hyper optimized websites".
If you want to clean some files, clean them once and mark them as not rewritable on the FTP server, so that they're never erased by new code, maybe.