We are about to repaint our custom kitchen cabinets that are 20+ years old. These were very costly and made by a high-end cabinet manufacturer so we are going to try to refinish. We were told they were hand-glazed. They are in great shape other than glaze (I think) off near a few door knobs. Can someone advise as to process. I watched a Youtube where the remove glaze with oven cleaner and very fine steel wool. Thank you.