My son lit our woodburner and left a cast iron ornament on the top. The bottom had a felt bottom and it is now welded to the top?
Use a hot blow dryer to soften the felt. Use a nylon scrubber to clean the stove.
I'd soak it off. I imagine it might be similar to getting things that are stuck to cast iron pans off: soaking.
Is just the felt stuck or the entire ornament? I can't imagine it being hot enough to weld iron to iron. The felt should soak off or peel off.