I went to an older website I had created and was dismayed to find over 1,500 comments! Using the WordPress delete comments feature only allowed me to delete 20 comments at a time. I felt a little overwhelmed with over 1,500 comments to delete. Then I discovered Delete All Comments of WordPress on the Internet. The plug-in was very easy to install, and then I was able to delete the 1,500 comments in no time — so remarkably quickly! It was brilliant! Thank you so much Navneet!