Only the owner of a blog or an administrator can delete a comment from it. Deleted comments cannot be restored.
1. Retrieve the Blogs service document. See Retrieving the Blogs service document.
2. In the service document, locate the workspace for the blog, locate the Comment Entries Atom collection within the workspace, and then copy the web address in the href attribute of the Comments collection.
3. Send a GET request to the web address you copied from the previous step. In the returned feed, find the comment entry that you want to delete, and make a note of the web address for it, which is specified in the href attribute of its rel=edit link.
4. Send a DELETE request to the web address of the edit link of the comment that you noted in the previous step.