Thread:Project:Support desk/need help cleaning up spammed wiki/reply

If you can identify the "good" pages, you can Special:Export them, nuke all pages (using nukeNS.php for example, for entire namespaces) and reimport them.

If you can identify the "bad" pages and you can get a list of them, you can use NukePage.php to permanently delete them. You can create a script that runs this script in batch mode for each page.