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Anyway it depends on the nozzle. If it's really small you might be best going some sort of soak / chemical / ultrasonic route, otherwise I use these types of tools:

This is the Mack kit, the blue thing with all the steel rods is my goto: https://www.ebay.com/p/?iid=391377090217&&&chn=ps

This is the H&S nozzle cleaner, good too: http://www.chicagoairbrushsupply.com/noclne.html
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