Polishing/renovating porcelain bath

Hey guys, I have a 40 year old bath, either steel or (probably) cast iron with an original porcelain finish. Considering the age it's actually in pretty good condition but the bottom is now dull with many very fine scratches caused, I guess, by abrasive cleaners.

I'd like to have a go at polishing the bath up, and was thinking of the green (al oxide?) polishing compound as used on mop buffs or auto cutting compound with an electric buff but wondered if anyone else has tried polishing up a porcelain bath or basin?

Pete


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