If all else fails, I've had some luck using a torch with a wide brush flame on the threads: the caseback and mid-case heat at different rates and that can sometimes break loose the dirt or gasket. Don't try this if you're not ready to sacrifice the dial or acrylic crystal, that hasn't happened to me yet, but I'm aware that it could be a consequence if I overheat the watch.
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"Do you like Breitling?" "I don't know, really, I've never been Breitled"
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