Method for de-icing a vehicle window, said vehicle being equipped with a de-icing device comprising: h. at least one tank containing a de-icing liquid, i. a tube system connecting said at least one tank to openings through which said liquid is sprayed onto said window, j. a pump intended to cause said liquid to circulate in the tube system until it is ejected via said openings, and k. at least one wiper blade able to move on said window between a low position and a high position, l. a drive motor for rotation of said at least one blade, m. a sensor of the temperature T outside the vehicle, and n. an electronic unit for controlling said motor and actuating said pump, characterized in that it comprises a step 1) consisting in: ejecting the liquid via said openings and adapting the quantity Q of liquid sprayed as a function of said outside temperature, so that: - when said outside temperature is equal to T1, a quantity Q1 of liquid is ejected via said openings, and - when the outside temperature is equal to T2, with T2 < T1, a quantity Q2 of liquid is ejected via said openings, with Q2 > Q1, - said step 1) being executed by regulating the rotation speed V of said at least one blade, so that: - when said outside temperature is equal to T1, a speed V1 is applied to said at least one blade, - when the outside temperature is equal to T2, a speed V2 is applied to said at least one blade, with V2 < V1; or the step 1) of the method consists in ejecting the liquid via said openings and maintaining the quantity Q of liquid sprayed constant whatever said outside temperature, so that: - when said outside temperature is equal to T1 and said liquid has a viscosity W1, the quantity Q of liquid is ejected via said openings, and - when the outside temperature is equal to T2, with T2 < T1, and said liquid has a viscosity W2, with W2 > W1, the same quantity Q of liquid is ejected via said openings. h. at least one tank containing a de-icing liquid, i. a tube system connecting said at least one tank to openings through which said liquid is sprayed onto said window, j. a pump intended to cause said liquid to circulate in the tube system until it is ejected via said openings, and k. at least one wiper blade able to move on said window between a low position and a high position, l. a drive motor for rotation of said at least one blade, m. a sensor of the temperature T outside the vehicle, and n. an electronic unit for controlling said motor and actuating said pump, ejecting the liquid via said openings and adapting the quantity Q of liquid sprayed as a function of said outside temperature, so that: - when said outside temperature is equal to T1, a quantity Q1 of liquid is ejected via said openings, and - when the outside temperature is equal to T2, with T2 < T1, a quantity Q2 of liquid is ejected via said openings, with Q2 > Q1, - said step 1) being executed by regulating the rotation speed V of said at least one blade, so that: - when said outside temperature is equal to T1, a speed V1 is applied to said at least one blade, - when the outside temperature is equal to T2, a speed V2 is applied to said at least one blade, with V2 < V1; - when said outside temperature is equal to T1, a quantity Q1 of liquid is ejected via said openings, and - when the outside temperature is equal to T2, with T2 < T1, a quantity Q2 of liquid is ejected via said openings, with Q2 > Q1, - said step 1) being executed by regulating the rotation speed V of said at least one blade, so that: - when said outside temperature is equal to T1, a speed V1 is applied to said at least one blade, - when the outside temperature is equal to T2, a speed V2 is applied to said at least one blade, with V2 < V1; - when said outside temperature is equal to T1, a speed V1 is applied to said at least one blade, - when the outside temperature is equal to T2, a speed V2 is applied to said at least one blade, with V2 < V1; or the step 1) of the method consists in ejecting the liquid via said openings and maintaining the quantity Q of liquid sprayed constant whatever said outside temperature, so that: - when said outside temperature is equal to T1 and said liquid has a viscosity W1, the quantity Q of liquid is ejected via said openings, and - when the outside temperature is equal to T2, with T2 < T1, and said liquid has a viscosity W2, with W2 > W1, the same quantity Q of liquid is ejected via said openings. - when said outside temperature is equal to T1 and said liquid has a viscosity W1, the quantity Q of liquid is ejected via said openings, and - when the outside temperature is equal to T2, with T2 < T1, and said liquid has a viscosity W2, with W2 > W1, the same quantity Q of liquid is ejected via said openings.