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
Text formulas:

Return ASCII values of characters
Replace cell references
Show formula error value
Concatenate and manipulate text

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