1 Tablespoon? I’d suggest testing this at home with garden hose handy to wash away the almost certain mess. A scant quarter teaspoon would be more like it. I tried a strong rubbing alcohol mix during mid-teens winter temperatures once, and got instant Jack Frost on the windshield. Stuff evaporates so well that it encourages ice formation.
When I was in Germany, vodka was the thing to use. Never ever froze!