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Two ingredients. 1. Toothpaste (easy score) 2. Coarse corundum or flint grit (not-so-easy score). You will need to visit a lapidary supply store (rock shop) for the grit. Once you have it, mix some with the toothpaste until you have a dark gray pasty mess. Find a jerk’s car, and smear a little on the windshield just above the wiper blades. The corundum is a substance used to grind away at ROCK. It will cut the daylights out of the window on the first wipe. There is no point in doing this if you use fine grit powders.