FIELD: propellant chemistry, in particular, methods of propellant decontamination. SUBSTANCE: at cleaning of rocket propellant tanks from remaining propellant of unsymmetrical dimethyl hydrazine formalin is added into the tank, its amount exceeding the amount of propellant in the tank by 10 to 20% the tank is rotated, then an aqueous solution of hydrochloric acid with a concentration of 30 mass percent is added to the contents, the tank is turned once more through 360 dwg. after that the tank is rinsed out with water removing the formed mixture. EFFECT: facilitated procedure.
