ORIGINAL: 89ram
preheat the oven to 350 degrees. turn it off then put in your tires. wait for 15 minutes, then take them out. use gloves. squeeze the tires and they should pop off of the beads. it worked for me. hope this helps.
I used these instructions as a guidline once - well, almost.. I left the oven on for the whole time, and "just to be sure" made it 20 minutes instead of 15.. I melted two tires and rims...
So, in other words, I think the way 89ram described it is probably about right...
Be warned though, it'll stink up your kitchen for a day..