To be honest Libra it's so long ago since I cleaned any kind of brass but I'm sure I once used baby oil to get dirt off gently and then warm soapy water to wash oil off , but as I say so long ago I may be wrong
if it's imitation brass as you say, I think I would just use a solution of water and washing up liquid, dry it then buff it up. If possible, I would try it first,where it can't be seen.
Sometimes I forget to like posts,but that doesn't mean I don't like them.
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