Method for de-icing by spraying a liquid organic de-icer, which is in particular a solution based on glycol, urea, formate and/or acetate, onto a movement area of an airfield, in particular onto a runway, a taxiway or an apron, by means of a self-propelled spraying vehicle, wherein the spraying vehicle comprises a control unit and a spraying device, and the control unit is set up to activate and deactivate the spraying of the de-icer by the spraying device, with the following steps: - driving into a first section and a second section of the movement area with the spraying vehicle, the first section being driven over in a first primary drive-over period (1PÜZ) and the second section being driven over in a second primary drive-over period (2PÜZ), and - spraying the de-icer onto the first section during the first primary drive-over period (1PÜZ) and defining a first primary spraying time assigned to the first section and lying within the first primary drive-over period, and - spraying the de-icer onto the second section during the second primary drive-over period (2PÜZ) and defining a second primary spraying time assigned to the second section and lying within the second primary drive-over period, - providing the first primary spraying time assigned to the first section and the second primary spraying time assigned to the second section in the control unit, - providing a first de-icer degradation time value assigned to the first section and a second de-icer degradation time value assigned to the second section in the control unit, - re-entering into the first section at a first secondary re-entering time and re-entering into the second section at a second secondary re-entering time with the spraying vehicle - detecting of the re-entering into the respective section by the control unit and providing of the first secondary re-entering time assigned to the first section and the second secondary re-entering time assigned to the second section in the control unit, and - activating a renewed spraying of the de-icer onto the respective section (13, 14) of the movement area if the respective primary spraying time (1PAZ, 2PAZ) has elapsed by more than the respective de-icer degradation time value at the respective secondary spraying time (1SEZ, 2SEZ). - driving into a first section and a second section of the movement area with the spraying vehicle, the first section being driven over in a first primary drive-over period (1PÜZ) and the second section being driven over in a second primary drive-over period (2PÜZ), and - spraying the de-icer onto the first section during the first primary drive-over period (1PÜZ) and defining a first primary spraying time assigned to the first section and lying within the first primary drive-over period, and - spraying the de-icer onto the second section during the second primary drive-over period (2PÜZ) and defining a second primary spraying time assigned to the second section and lying within the second primary drive-over period, - providing the first primary spraying time assigned to the first section and the second primary spraying time assigned to the second section in the control unit, - providing a first de-icer degradation time value assigned to the first section and a second de-icer degradation time value assigned to the second section in the control unit, - re-entering into the first section at a first secondary re-entering time and re-entering into the second section at a second secondary re-entering time with the spraying vehicle - detecting of the re-entering into the respective section by the control unit and providing of the first secondary re-entering time assigned to the first section and the second secondary re-entering time assigned to the second section in the control unit, and - activating a renewed spraying of the de-icer onto the respective section (13, 14) of the movement area if the respective primary spraying time (1PAZ, 2PAZ) has elapsed by more than the respective de-icer degradation time value at the respective secondary spraying time (1SEZ, 2SEZ).