Washing of expensive nuclear magnetic resonance (NMR) tubes has been a problem; washing each tube by hand can be time consuming and awkward. Akkerman reported a device which allows the tubes to be cleaned by a batch process. The tube washer described in the present paper was developed on similar principles, but has several advantages: Filling the tubes with cleaning fluids is more convenient, the washer can be emptied and the tubes dried very easily, and breakage of the tubes during the cleaning process has been greatly reduced.
David W. Mastbrook and Elizabeth A. Hansen, "Nuclear Magnetic Resonance Tube Washer," Appl. Spectrosc. 24, 612-613 (1970)