I had to take the valance off mine too. My pantry sets in the corner, and its door opens right into the valance - which prevents the pantry door from opening a full 90 degrees. When I installed the slide-out trays in my pantry, they wouldn't slide out until I removed the valance. I just popped off the buttons, removed the screws, and it came right off. Sorry you're having so much trouble with yours.
Have you tried C-3?
On second thought, tie one end of a rope around the valance and the other end around Tunce, then throw a steak across the room. He'll have it off of there in no time!