Thread:Brandon Rhea/@comment-4146635-20120522205102/@comment-20644-20120522205521

Hi. I believe disabling and then re-enabling the comment feature will remove all of the comments. That said, I would advise talking to your community first. I'm sure there are good comments there left by other people, so getting rid of all comments gets rid of other people's good comments. They will not be able to be recovered later. Once they're gone, they're gone.

As for the question about anonymous users editing, please send that to Special:Contact. Thanks!