IMO I would not use a brass brush for artifact cleaning. Use a standard toothbrush and gentle use of the polishing compound. If you get to the "shiny brass" point then you have completely removed the original patina on that portion. I would go with the dawn and a regular toothbrush first to lighten it up, or regular toothpaste. Once you take off patina you can't put it back.
Good Luck
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