EZ-Soak from Brownells cleans all types of carbon, plastic and other fouling from choke tubes, gas pistons, revolver cylinders, rifle bolt faces and other gun parts without scrubbing. Simply drop the parts into the jar of EZ-Soak and let them soak for 15 minutes. After soaking, just rinse and wipe the parts clean. Available in a 16-ounce, wide-mouth bottle.