I use lemons as I have a tree in the back yard. De-cap first. Boiling water straight out of the jug, half a squeezed lemon, drop of dishwashing liquid, cases to half fill an ice cream container at a time then stir it all (might bottle brush internal necks if they where really sooty at this stage). Brass turns shinny pretty much instantly. Tip out in sink and rinse with warm tap water, let drain while still stirring, place on clean bath towel, role around to dry and final dry either out in the sun or hot water cupboard. I do this many days in advance before doing anything else to let cases totally dry.
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