The potato method works really well for me. I've had a couple of roos over the years who have split their spurs horizontally and would not stop bleeding for ANYTHING. Then the broken one would hit the undamaged one, knock off the blood clot, and continue bleeding--- so while I would (and do) leave them to their own on spurs, once there's a bleeding issue, I have to address it. When a rooster with an injured and bleeding spur mounts hens, he leaves blood on her wings. That can start something very ugly as we all know chickens LOVE blood.
So, I used the baked (microwaved) potato method - slipped over each spur, and used a wrench to give just the smallest twist and off it popped like a charm. I used dish towels, or some thick cotton wrap to protect the actual leg while the potato was on the spur, the heat is only applied to the spur itself. Almost no blood, spurs came off easily, rooster barely noticed, and spurs became short enough that they weren't knocking together perpetuating the injury. Healed up (both the injured and the uninjured side) in days. I did try the twisting it off with no potato but … ugh. Didn't work for me (or the roo).