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If you know a pharmacist ask him/her to order you a pint of 30% ammonia water. Put about a foot of copper wire in it and let it set with the cap on loosely for two or three days. Then remove the wire and use the solution on a patch wrapped around a nylon brush. Let the barrel set for 1/2 hour or so and run another soaked patch through. Should look like grape jelly on the patch. (I usually clean anyoil from the barrel with acetone before using the ammonia waater.) This system does work on heavily fouled barrels. CAUTION: smelling the solution will definitely clear your sinus)
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