Quick, clean, and to the point

Delete contents of selected cells

Windows shortcut 
Mac shortcut 

This shortcut will delete the contents of selected cells, leaving formatting intact.

On the Mac, Control-B also deletes cell contents of one or more cells.

Related videos

The videos below demonstrate this shortcut.
In this video, we show basic ways to enter data into a worksheet.
In this video, we show you how to edit data that's already been entered in a worksheet
In this video, we compare formulas and pivot tables side-by-side to build the same reports to demonstrate how powerful and easy to use pivot tables are.
In this video, we show you how to use a lesser-known alignment option called Center Across Selection to center text without changing the worksheet grid.