I recently was given an old cast iron corn muffin pan. It's been difficult to remove ... I recently was given an old cast iron corn muffin pan. It's been difficult to remove the rust in the tiny crevices. These brushes did the job. I use these, also, to remove baked/cooked on gunk from the odd, hard to reach parts of my stainless steel pots and pans - especially around and the underside of handles.
I will definately buy more in the future.