Maybe kind of an unusual rust box, but with the kids gone and the downstairs empty, thus an unused bathroom, I hook the barrels on a coat hanger and hang the barrels on the curtain rod. I then run a bit of warm water in the tub. I need to refresh the water every now and then, but it works.
Obviously my method isn't for a large production operation, and of course my wife complains about it if she goes downstairs to do laundry or happens to go downstairs for some other reason and spots the hanging barrels.
