The invention is a windshield washer preparation, a method for producing the preparation and a device that produces the preparation. The method uses the dehydration of methanol and distillation of dimethyl ether to produce the preparation and a propellant for pressurized packaging. The washer preparation contains deionized water, methanol, dimethyl ether, dimethyl carbonate and additional compounds selected from the group consisting of dyes, de-foaming agents and surfactants. The disclosed method and device can formulate varying combinations of methanol, deionized water and dimethyl ether using the methanol dehydration reaction prior to the addition of dimethyl carbonate. The preparation can be used in automobile washer reservoirs or directly on the windshield using trigger spray applicators or an aerosol can. The excess dimethyl ether from the method can be used taken from the system and stored for future use.