<P> Many cars display a warning when the fluid level is low, and some car makers have replaced the float sensor generating this signal with a simple two - pin probe in the tank . This requires a (slightly) conductive fluid, but most common windshield washer fluid mixtures will work . Mercedes sells a special fluid for their cars . </P> <P> Concerns have been raised about the overall environmental aspects of washer fluid . Widespread use of wiper fluid (amounting to billions of liters each year) can lead to cumulative air pollution and water pollution . </P> <P> Consumer advocacy groups and auto enthusiasts believe that the alcohols and solvents present in some, but not all, windshield washer fluid can damage the vehicle . These critics point to the corrosive effects of ethanol, methanol, and other components on paint, rubber, car wax, and plastics, and groups propose various alternatives and homemade recipes to protect the finish and mechanics of the motor vehicle . </P> <P> On 14 June 2010, the UK's Health Protection Agency announced the results of a preliminary study of 75 patients, which found an association between the use of plain water as wiper fluid and Legionnaires' disease, which is spread by breathing in aerosolized bacteria from infected water . It had been noticed that prevalence of the disease was five times higher among professional drivers . </P>

Can you use windshield washer fluid to clean your car