You can get large cans of acetone at Home Depot--much cheaper than nail polish remover. I use it to clean crud out of MC gas tanks.
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Used some nail polish remover and some 0000 steel wool. well soaked and very light (no pressure) rubbing has revealed good deep blueing. The nooks and crannies are gonna be tough - might go find a brass brush.View attachment 209837
I'm sure they are but it appears to be worth the effort! Well done....The grooves on the cylinder are becoming a pain. Has a beautiful blue finish underneath