How do I delete my comments?

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I recently posted a discussion about pink elephants running across my page. And I think I figured out where they have come from. Im thinking someone must have posted them in a HTML comment for me. Maybe thinking that they would only show up in there comment. So now I need to know how to delete comments. I tryed really hard to figure it out and came up with noting. So can anybody please help me on this one? I will be forever in your debt so I will never have to see those darn pink elephants again.