If on this sheet tab, delete it from another.

A different approach from aikimark, based on formulas and filters, rather than dictionaries and loops. Nothing wrong with his approach, but I wrote this code so I might as well post it.

Thomas

Sub macroClean()

Dim lLastRow As Long

lLastRow = Sheets("MasterList").Cells(Rows.Count, 1).End(xlUp).Row

'turn off updates to speed up code execution
With Application
    .ScreenUpdating = False
    .EnableEvents = False
    .Calculation = xlCalculationManual
    .DisplayAlerts = False
End With

With Sheets("TemplateLayOut")
         
    With .Range("T5:T" & .Cells(.Rows.Count, 1).End(xlUp).Row)
        .FormulaR1C1 = _
            "=SUMPRODUCT((MasterList!R2C1:R" & lLastRow & "C1=TemplateLayOut!RC[-19])*1*(--(LEFT(MasterList!R2C3:R" & lLastRow & "C3,10))<TODAY()))"
        .Value = .Value
    End With
    
    With .Range("$A$4:T" & .Cells(.Rows.Count, 1).End(xlUp).Row)
        .AutoFilter
        .AutoFilter Field:=20, Criteria1:=">0"
        .Offset(1).SpecialCells(xlCellTypeVisible).EntireRow.Delete
        .AutoFilter
    End With
    
    .Columns("T").Delete

End With

With Application
    .ScreenUpdating = True
    .EnableEvents = True
    .Calculation = xlCalculationAutomatic
    .DisplayAlerts = True
End With


End Sub

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How about this:

Sub Demo()

    Dim rngMasterList As Range, cMasterList As Range
    Dim rngTemplateLayOut As Range, cTemplateLayOut As Range
    Dim arrExpiredRows() As String
    Dim i As Integer
    Dim wsTemplateLayOut As Worksheet

    Set rngMasterList = Range("C2:C" & Range("C1048576").End(xlUp).Row)
    Set wsTemplateLayOut = Sheets("TemplateLayOut")
    Set rngTemplateLayOut = wsTemplateLayOut.Range("A5:A" & Range("A1048576").End(xlUp).Row)

    ReDim Preserve arrExpiredRows(0 To 1)
    
    Sheets("MasterList").Activate
    
    For Each cMasterList In rngMasterList.Cells
        If CDate(Left(cMasterList.Value, 16)) < Now() Then
            ReDim Preserve arrExpiredRows(0 To UBound(arrExpiredRows) + 1)
            arrExpiredRows(UBound(arrExpiredRows)) = Range("A" & cMasterList.Row).Value
        End If
    Next

    For i = LBound(arrExpiredRows) To UBound(arrExpiredRows)
        For Each cTemplateLayOut In rngTemplateLayOut
            If cTemplateLayOut.Value = arrExpiredRows(i) Then
                cTemplateLayOut.EntireRow.Delete
            End If
        Next
    Next

End Sub

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@Thomas

I was originally going to create a criteria filter for the deletion, but the dictionary was quicker.  The ease-of-implementation was the non-datetime format of column C (Valid Until) data.

For future readers:
1. create a new worksheet
2. copy A:C from MasterList to the new worksheet
3. find/replace " EST" -> "" in the Valid Until cells in the new worksheet
4. Create a criteria range in H1:I2 in the new worksheet
Example using today's date

Cat Code	Valid Until
        	<4/3/2014

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5. Apply an advanced filter to copy the unique values to E1 in the new worksheet with the criteria range from 4.
6. Apply an advanced filter in the TemplateLayOut worksheet, using the new_worksheet.range("E1"),newworksheet.range("E1").End(xldown) range
7. Delete the visible rows in the filtered TemplateLayOut worksheet.
8. Delete the newworksheet

Note: The first criteria range on the new worksheet can also be the one Valid Until column.  The Cat Code is superfluous in this algorithm description.

While it would be possible to have done the filtering in the MasterList sheet, I'm not comfortable offering solutions that mess with production data.

While my posted code iterates the cells of the MasterList, I could have transferred these values into a variant array in a single statement. Iterating the variant array is much faster than iterating the cells in a range.

I do this in my Better Concatenate Function article:
https://www.experts-exchange.com/A_7811-A-Better-Concatenate-Function.html

This is the inverse operation I describe in my Fast Data Push to Excel article:
https://www.experts-exchange.com/A_2253.html

Worked great for me too.  Thanks. for the help. EXCELent!!