Removing rust from valves

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    I am working on an 1985 Mercruiser 140 inboard boat engine. I am in the process of getting it running again after some water got in the engine and froze it.
    Last night I removed the valves from the head. The back of the valves are pretty rusty. How can I remove this rust without harming the valve? I was going to use a wire wheel on my bench grinder but i’m afraid of harming the valve.

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