No one spends any modicum of time thinking about windshield wiper fluid. No one. Not even the fine folks at Rain-X have ever thought about it for more than a half-hour pitch meeting.
Yet every car owner in America can recount a time when they ran out. Anyone who has ever driven through Eastern Arkansas in the summertime will tell you how crucial windshield wiper fluid is to a positive driving experience. Fun fact: Roughly one-third of the gross domestic product of the quaint town of Tuckerman is replacement fluid sold to road-weary travelers seeking relief from bug guts.