Applying water to a cold aircraft for the purpose of defrosting an aircraft it is a really bad idea. Letting alone all the aspects of it refreezing on the lifting surfaces, and being very much more difficult to remove, than the frost was to begin with, it will flow into, and freeze all kinds of other airframe parts - including controls system components.
There are proper deicing fluids for defrosting aircraft, or put it in a heated hangar if available. As a last, and least effective means, a soft brush or broom, but this is a lot of work, not entirely effective, and does put wear and tear on the painted surfaces. Best to prevent the frost in the first place, hangar the plane, or as a last resort, put on wing covers the night before.