systems and sub - systems for supplying squeegee buckets with automobile windshield washer fluid . some systems include a fluid containing reservoir elevated above the squeegee buckets so as to gravity feed the buckets . one system includes a fluid quantity sensor coupled to a squeegee bucket for indicating a predetermined low fluid quantity in the squeegee bucket , calling for the addition of fluid . the fluid quantity sensor can be coupled directly or indirectly to a controllable fluid supply source to add fluid into the squeegee bucket interior . some systems have continuous or analog fluid quantity sensor outputs while other systems have discreet fluid quantity sensors indicating that a low limit has been reached . some systems utilize level sensors while other systems utilize weight sensors . one system includes a level sensor in the form of a float adapted to trigger an electrical switch upon reaching a low level . when the low level limit is reached , a valve in fluid communication with a fluid supply source is opened to allow fluid flow into the squeegee bucket interior . some systems allow a predetermined time flow of fluid or a predetermined volume flow of fluid . other systems terminate flow into the squeegee bucket when a high level fluid quantity is indicated , for example , by a high level limit being reached by a level switch . systems can also include logic within controllers to detect leakage and / or pilferage and further logic to limit or stop excessive fluid usage through pilferage or leakage . the invention allows continuous replenishing of windshield washer squeegee buckets , not requiring frequent human action to refill the buckets . the present invention can be used in lightly staffed or completely unstaffed , 24 - hour gasoline service stations and convenience stores , providing windshield washer fluid with minimal personnel costs .