That stubborn cooked on edge of oatmeal or baked egg frittata residue will work your elbow hard as well as that now dingy sponge.
Try this broomcorn scrubber to scour your pots, pans and porridge spoons. Its stiff bristles are abrasive enough to scour but not scratch those metal surfaces.
Once it has lived its long life you can cut the twine and compost.
Made locally in Missoula, Montana.
size - 4 x 2 inches approx