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will carb cleaner harm the blueing?
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Go to Walmart and get a couple of cans of their store brand "Tech" carb cleaner (less than 2 bucks a can).
It will absolutely NOT harm bluing, but, it WILL affect some stock finishes and certain plastics, so either remove those parts or cover them to avoid splashover. Generally it doesn't affect things like polypropylene or polymers at all.
It's a super degreaser, too.