I think I remember learning once that one can kasher something that requires libun (e.g. a pan or cookie tray) by cleaning it and putting it in a self-ceaning oven. Is this true? If so, it sounds much easier than using a blowtorch.
According to the 2014 OU Jewish Action Passover Guide on page 14 under "Libun (Burning)"
A self-clean cycle of an oven(approx 850 degrees F) also qualifies as libun
I have done it but it can also mess up some utensils. I was also been given this advice by the Baltitimore star-k, when I called the office.