educationallife.fact on Instagram: "The square-shaped wiper rubber works better because it maintains more consistent contact with the windshield. Its wider, flatter edge spreads pressure evenly across the glass, helping it push water away instead of flexing or lifting. Triangular profiles can bend under load, which reduces stability and often leads to streaks — especially in low-speed, simple conditions like this test. In cases like this, the simplest design does the job best."