Clearing Selected Cells On A Form

I have compiled the following code with bits from here there and everywhere to clear the user entered details on a form. My problem is that I need to retain or reset to "Please Select" the cells with drop down lists.

In list form, I am trying to;

Unprotect the worksheet,
Select the cells with drop down lists and lock them,
Delete the contents of unlocked cells,
Selecting and unlocking the cells with the drop down lists ready for re-use,
Re-protect the worksheet.

(I probably should mention that my "Form" is just a formatted worksheet that looks like a form on the screen and when printed, not any sort of inbuilt Excel function that I have read about somewhere, probably here)

Code:
Sub ClearUnlockedCells()
'
' Clearform Macro
' Clear entered data from Form.
'
Dim WorkRange As Range
Dim DVRange As Range

[code].....