As of my knowledge cutoff, YouTube does not provide a feature to delete all your comments at once. You will need to delete each comment individually by following these steps:

    1. Go to the video where the comment is located.
    2. Locate your comment and click on the three dots icon next to it.
    3. Click "Delete."
    4. Confirm the deletion.

Repeat these steps for each comment you wish to delete. Keep in mind that once a comment is deleted, it cannot be undone. Additionally, deleting a comment will also delete any replies to that comment.
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