MS Excel
If you need to remove only the formatting done in a range (numbers and formula typed there should not be removed), you must

From Edit menu choose Delete
Double click the Format Painter and then press Esc key in keyboard
From Edit menu choose Clear and then Formats
Click on Remove Formatting tool on Standard Toolbar

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MS Excel
How do you delete a column?

Select the row heading you want to delete and select Edit>Delete from the menu
Right click the column heading you want to delete and select delete from the shortcut menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Select the column heading you want to delete and select Insert Delete from the menu

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