Yes, some bronze wool commonly found at good hardware stores (not usually found at "home improvement" places) is best. Don't use a penny! Well, you can- but it has to be made before 1982. The post 1982 pennies containing zinc will scratch the metal once you get through the thin copper outer layer. If it is heavy rust, take a brass (not nickel plated or aluminum) .22LR fired case and smash the end together and use it as a scraper- it won't scratch the metal, but it will leave brass on the metal which you can get off with solvent and a cloth.

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Lost it all in a boat accident