To open the Document Inspector, click File > Info > Check for Issues > Inspect Document. The Excel Document Inspection window shown below opens up.
Click Inspect to identify hidden content, and then click Remove All to remove the item of your choice.
After you have completed these steps, save the document, and the spreadsheet will not contain the hidden data that you have removed.
To selectively edit or remove document data, click File > Info > Properties. Delete or edit information.
Microsoft Excel offers the ability to add comments to workbooks. Typically, comments contain the name of the person who created them, and they appear as a small red triangle in the upper-right corner of a cell.
To view a comment, click the cell and the comment will pop up.
To delete a comment, right-click the cell containing the comment, and then click Delete Comment on the shortcut menu.
In Microsoft Excel, it is possible to hide entire rows and columns of cells within a worksheet.
To unhide all of the cells in a worksheet:
Workbooks in Microsoft Excel may contain hidden sheets that contain information.
To unhide sheets:
Microsoft Excel includes a Track Changes feature that allows you to track changes made to a shared workbook by a user. To remove tracked changes from a workbook, follow these steps:
Learn more about Tracking and Reviewing Changes in Microsoft Excel at the Microsoft Excel 2010 Help and How-to web site.