How to Remove Your Comments from YouTube
New this year on the popular video site YouTube.com is the ability to delete comments you once posted and now regret. To remove such a comment, login to your YouTube account, go to the “Text Comments” section below the appropriate video, and click the “Remove” button next to your comment.

There is no remove button, even when logged in.
Comment by Abu Hol — September 10, 2009 @ 4:39 am
Never mind. Found it. Thank you!
Comment by Abu Hol — September 10, 2009 @ 4:40 am
Removing the comment still leaves a post that says, “Comment Removed”, but the post itself is still physically there. I want to retype my comment, because in the first one I made a typo.
Comment by Jessi Lien — July 21, 2010 @ 7:16 am