MsOf10 Can't delete blank columns

I have a worksheet with data in columns 'A' to 'BD' and rows 1 to 6776, however when I press ctrl+end I'm taken to ASD6776. In an attempt to get rid of all columns to the right of BD I

1. Selected column BE
2. Pressed ctrl+shift+the right-arrow key (which selects columns BE to XFD
3. In the Immediate Window I entered selection.clear and pressed return
4. I then went back to the sheet, right-clicked in the selection and chose Delete

When I did ctrl+end again it still took me to ASD6776!

How can I delete those unneeded columns?