Delete all comments in WordPress (as well as posts, custom posts and revisions)

These snippets will bulk delete all posts/custom posts/comments/revisions from WordPress blog totally, removing them from database. Proceed with caution.

Delete all posts:

https://gist.github.com/sabrina-zeidan/449c10b84b2fde7a0d0d08cd5592d297

Delete all custom posts:

https://gist.github.com/sabrina-zeidan/e7cae401a1cd88d902f28d28431fbd92

*mind to change “book” to the custom post type name you want to bulk delete

Delete all post revisions:

https://gist.github.com/sabrina-zeidan/9172bb053945bf2b4e9b9a9200d3d9cc

Delete all spam comments:

https://gist.github.com/sabrina-zeidan/5d8220f1d4c82eef9b233576deb74739

Delete all comments:

https://gist.github.com/sabrina-zeidan/907b576d47589901c5a1a9549a1dcb2a

Read how to delete tags and terms here and images clean up is here.