I got long tubes because I have a bong thats located about 5 feet away from my pc
what I did to clean mine was stick a AA battery in one end of the tube(pretty damn good fit for 1/2ID) fill it with some water then spray some tilex in... put another battery in the other end and shake the length of tube so the tilex and water could mix and cover each part of the tube, take out batteries and flush the tubes with water to try to get rid of some of the tilex
dont know how good it is for closed loops though
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