If you want to clear all the formatting in an Excel spreadsheet, you can try using the undo button. However, this will only undo a certain number of changes and it will affect all the changes you have made. A more appropriate method is to use the Clear | Formats option as described below.

To clear the formatting in Excel 2002:

1. Select all the cells in the worksheet using the CTRL + A keystrokes.
2. On the Edit menu, point to Clear, and click the Formats option.