I have a solution that does not require you to download anything.
It's kind of hacky but I mean anyone can do it.


So to delete all of your Youtube comments automatically,  go to your [YouTube Comment History][1]

First, I'd recommend deleting one comment and disabling the confirmation warning. 

Then, open the console in your browser(in chrome press ctrl+shift+j), then paste in this code : 

    num=6
      for(i=0;i<20;i++){
      y = document.getElementsByClassName('VfPpkd-rymPhb-ibnC6b');
      y[num].click();
      num=num+2;
    }

Then press Enter. 

To explain this code: it grabs the buttons on the page, then grabs the first delete button and clicks it, then goes through that cycle 20 times. So if you want to delete more than 20 comments at once you have to change 20 to a higher number. Only so many comments appear on the page at once so I just set it to 20. 

Hopefully this lightweight solution will help someone out and save a lot of time and clicks






  [1]: https://myactivity.google.com/page?hl=en&utm_medium=web&utm_source=youtube&authuser=3&page=youtube_comments