Anybody who's regularly driven in winter conditions knows the importance of keeping windshield washer fluid topped up. Keeping the salty grime stuck to your windshield and rear window to a minimum is crucial for visibility, especially in inclement weather. In the case of an autonomously operating vehicle, ensuring visibility for the vehicle's sensors could similarly be a matter of life and death. That's particularly true for Tesla's Cybercab ride-hailing vehicles, which rely entirely on camera feeds.