Help Surface restoration on OEM MC22 muffler

Hi team. I have in my possession an original Honda muffler for my MC22 as thankfully the previous owner was smart and kept it after replacing it with a stainless unit.

It is in really good shape apart from some light scratching on the outward side and general oxidation all over. I’d say it’s been pushed against something in a garage as the scratching is very light.

Does anyone have any thoughts around how I could restore this to an original looking condition? I would be keen to see examples of any that have been done to see how it turned out.

Pictures are attached.

Thanks for your time.