You see, Google’s self-driving cars are decked out with all kinds of sensors. They have cameras, radar sensors, and laser-based sensors known as Lidar. All of these sensors let the car see the world around it so that it can safely navigate from point A to point B.The wiping system includes multiple wipers that are capable of rotating 360 degrees around the dome protecting the sensors. According to the patent, the system could also have some sort of wiper fluid that is activated along with the wipers, so that whatever is dirtying up the dome can quickly be clean off. While a self-cleaning system might seem like a minor thing, it’s actually a pretty significant design detail that demonstrates just how fragile self-driving car systems can be.