Inavinate on Instagram: "They’re using a simple but clever physics-based method to clear a blocked drain using nothing more than a tire and a rope. The tire is lowered into the drain and pulled back and forth, acting like a flexible plug that creates alternating suction and pressure inside the pipe. As it moves, water is forced to surge around it, loosening mud, leaves, and debris that have built up over time. At the same time, the rubber tire presses against the pipe walls, scraping buildup wit