Remove code-history of indexed website? Possible?

Once the HTML/CSS/JS of a website has been indexed by google (and whatever else) is it then completely impossible to erase that code-history of the website? I.E google caching, way back machine ETC. Theres some things from a website I want to remove the history of but, thinkin it 开发者_Python百科isn't possible?

You can add a robots.txt file denying access to everything, and that will take your site (and likely its cached versions) out of Google and the Wayback Machine, but there are likely other sites that can archive your site that don't heed robots.txt. There's not much you can do about that besides asking the owners of the site to remove it.