WiperFill is an inline-underhood system that converts rain water or other liquids near the windshield area into wiper fluid or antifreeze. Designed to eliminate the need to manually refill the wiper fluid reservoir, WiperFill collects water at the base of the windshield and directs it into its custom mixing device to produce clean, spot-free cleaning and antifreeze fluid. The system is made up of a fluid collection point placed at the base of the windshield and a multi-chamber mixing cartridge that utilizes wiper fluid or antifreeze concentrates to achieve the proper saturation level. The cartridge of concentrated fluid is designed to last up to one year, being replaced during normal maintenance, according to the company.