I think this will work for a guest. It works for a regular user, so it follows logically that it would work for a guest....
Use Advanced Search.
Put in "guest" as the username, click on "show results as posts" in the lower left, hit Search.
Click on the box in the upper right of the results to choose all the posts. Use the moderation pull down menu at the bottom to delete them.
This may take some time. There may be an easier way, but I don't know it off the top of my head.
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