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Camping gas cooker, hold rim in fingers, neck in flame rotating the case, when it gets too hot (usually the same time the blue tint appears on brass, you shouldn't heat any further than that,...

Aaargh, don't put the brass in the oven!
That will stuff it up.

Pink residue is from the brass after carbon oxidising is removed, don't be too worried.
I shake the water out and normally anneal the brass after and that dries the brass damn quick.

I use the citric acid from the baking section in the supermarket, half to full teaspoon into hot water and a squirt of dishwashing liquid.
Rinse with clean water after 15 min or so and bingo.