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An 1884-O Morgan in "average" condition is not particularly valuable, and having been made as part of a silver bowl could have created some damage around the edges or rims, which probably wouldn't make much difference anyway.

It's never a good idea to clean coins that have numismatic value above the silver or gold content.

If you plan to sell the bowl with the silver dollar, I would not clean it, because the potential buyer might prefer it in its current condition - and they could clean it later, if they wish.

If you intend to keep the piece, and want it cleaned up, I'd say there's not really much down side.