Delete all

OK.

My head is spinning a bit after this so I hope this version has you sorted!

I added a code which allows you to show or hide the Add formulas to sheets button- to show the button, type "show" in cell C1 of the FRONT sheet (no inverted commas, case sensitive). To hide it, type "hide" (same rules).

The 'Delete all button is generally visible at the extreme right of the FRONT worksheet, occasionally a little cut off but I ended up not grasping the nature of how it has to be positioned.
Clicking it deletes any free text from the relevant sheet as well as the specified content on the FRONT sheet.