Removing Custom Taxonomies and Types

This plugin is a wrapper for WordPress’ existing functionality. In WordPress, there is no way to delete a custom post type. That’s because they aren’t really created in the first place — if you remove the code declaring a custom post type (or taxonomy), it no longer exists. That said, any posts that are a member of that post type would be somewhat orphaned once you remove the UI for interacting with them, so you should delete those posts before removing your custom post type code.