Doesn't work any better on brass than other modern products as far as I can tell. I have a spare 1/2 can of the old Brasso formula and am using that as a reference. While this can lighten unstained brass, it does not appear to remove significant dark tarnish whether elbows are soaked or smudged. I haven't tried copper yet. It smells very strongly of ammonia, like many EPA-approved brass cleaners that have petroleum distillates removed from their formulas.
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