Button To Clear multiple cells in multiple tabs

It worked on your workbook here.
What if you go
Developer
Macros
Highlight (Select) "Maybe" in the little window
Run

BTW, did you check all the sheets?

I deleted all the pictures in the sheets to make the file size smaller.

[ATTACH]n1207492[/ATTACH]

I looked at your workbook and you do indeed have those cells identifiable by the same interior colour, so it's pretty easy:

Sub Clear_Cells()
Dim ws As Worksheet, cell As Range
  For Each ws In ActiveWorkbook.Worksheets
    For Each cell In ws.Cells.SpecialCells(xlCellTypeConstants)
      If cell.Interior.ColorIndex = 4 Then cell.Value2 = 0
    Next
  Next
End Sub

Thanks for letting us know.
Good luck