Removing data from a cell
Data can be removed (deleted) from a cell in several ways.
Removing data only
The data alone can be removed from a cell without removing any of the formatting of the cell. Click in the cell to select it, and then press the Backspace key.
Removing data and formatting
The data and the formatting can be removed from a cell at the same time. Press the Delete key (or right-click and choose Delete Contents, or use Edit > Delete Contents) to open the Delete Contents dialog. From this dialog, the different aspects of the cell can be deleted. To delete everything in a cell (contents and format), check Delete all.
Delete Contents dialog