Ok fair enough
More tricky, you'll have to have a macro for this
First what do you want to replace them with ? Space perhaps.
The Alt+Enter is only stored as a Newline by Excel
So something like this
Sub Remove_Newlines_From_Cell()
Dim myRange As Range
Set myRange = ActiveWindow.RangeSelection
'
For Each c In myRange.Cells
c.Value = Application.Substitute(c.Value, vbLf, " ")
Next
End Sub
Select a range, run the macro
You'll need to format each cell to have WrapText off
otherwise you may not see much change in the sheet
This could be acheived by adding
c.WrapText = False before the Next statement
Steve