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

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

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MS Excel
How do you delete a column?

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

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