I have a Google Spreadsheet with several boxes with the little orange triangle indicating a comment associated with that cell. Unfortunately, I haven't made any comments, so cannot delete these boxes. How do I go about clearing these cells without deleting everything and starting over?

• Where did the comments come from? Is this a shared spreadsheet? Is it copied from someone else's spreadsheet? – ale Dec 28 '12 at 20:03
• Comments, as opposed to notes, can be made by multiple people. If this is a shared spreadsheet you may not be able to delete them. – ale Dec 28 '12 at 20:05
• I'm not sure where the comments are coming from. The sheet is only shared with one other person, and he is having the same problem only worse. Both sheets show a different number of comments, all of which appear to be empty. I've tried adding a comment with the intention of deleting it, but any square with the phantom comment flag won't allow me to add a new comment to it. If I delete a row (or a column) containing the phantom comments, they disappear. Reinserting the column (or row) causes the comments to reappear. – Lazarus Dec 28 '12 at 21:03
• If I were you, I'd start with a new spreadsheet and copy the data over. – ale Dec 29 '12 at 15:27

Generally speaking, you should be able to right-click one of the cells, choose Insert comment, then click the delete link. After you confirm the comment(s) should be gone.