Open the Powerpoint presentation with the notes you wish to remove.

Save a copy of the presentation so you can keep the original with the notes.

In the copy, click the File tab in the Ribbon.

Click Info and click the Check for Issues button. A drop-down menu appears.

Select Inspect Document. A dialog box appears.

Ensure that Presentation Notes is checked (you may need to scroll down in the dialog box) and then click Inspect. If there are speaker notes in the file, a Remove All button will appear indicating that notes have been found.

Click Remove All beside Presentation Notes to remove all notes. Note that this cannot be undone.

Click Close.