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:

Delete all custom posts:

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

Delete all post revisions:

Delete all spam comments:

Delete all comments:

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