PURPOSE: To safely and effectively execute gunpowder removing in a short time by bringing a water jet containing no polishing agent from an inlet to an artillery shell, etc., to crush the gunpowder and to remove it.

CONSTITUTION: A water jet containing no polishing agent is brought from the inlet of an artillery shell 12 charged with TNT11 into contact to crush the TNT11 and to remove it. Thus, the gunpowder removing of the shell, etc., can be conducted in a short time. Since the gunpowder can be removed without melting the shell, the shell can be easily recovered, and since the gunpowder can be removed without adhering to a bullet shell like a melted gunpowder, the cleaning of the shell after the gunpowder removing is facilitated.