Tumblers and walnut/corncob media are old school. These days many shooters prefer processing brass rapidly with an ultrasonic cleaning machine. When used with the proper solution, a good ultrasonic cleaning machine can quickly remove remove dust, carbon, oil, and powder residue from your car
VEVOR 10L Ultrasonic Cleaner, 304 Stainless Steel Professional
Ultrasonic Cleaning Tips for Brass?
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Best Ultrasonic Brass Cleaning Solution:1 Gallon Bottle
Best Ultrasonic Brass Cleaning Solution:1 Gallon Bottle
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What's The Best Way To Clean Brass?