MS Excel
Comments can be added to cells using

Edit > Comments
File > Comments
View > Comments
Insert > Comments

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MS Excel
Text formulas:

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

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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
From Edit menu choose Clear and then Formats
Double click the Format Painter and then press Esc key in keyboard
From Edit menu choose Delete

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