I have a 3" PVC tube with a cap glued on one end and an expandable cap on the other end, cut to 40". I buy a gallon of WD40 (water displacing oil) and fill it up. All available at Lowes. If the barrels get soaked on a double, I take them and with a wire attached place them in the WD40. After a while I pull them out and let them drip as much back into the tube as possible. Then I hang them and later wipe the rest off. That way I am pretty sure that the oil had displaced any water, even inside the ribs. If you know there are voids in the ribs, as Foxes are famous for, I blow them with an air compressor and repeat.
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