In other words, don't use water in place of actual windshield washer fluid.
http://www.dailymail.co.uk/health/article-1286423/Windscreen-water-cause-cases-potentially-fatal-Legionnaires-disease.htmlTraces of the legionella bacterium, which can cause the potentially fatal lung infection, were found in one in five cars that did not have the additive.
Read more:
http://www.dailymail.co.uk/health/article-1286423/Windscreen-water-cause-cases-potentially-fatal-Legionnaires-disease.html#ixzz1BLf1I000It was not present in any vehices that had screenwash. Most at risk are people driving a van, those who drive through industrial areas, and drivers who often have the car window open, according to the study by the Health Protection Agency.
But the ‘most intriguing’ higher risk group was drivers not using screenwash.
Read more:
http://www.dailymail.co.uk/health/article-1286423/Windscreen-water-cause-cases-potentially-fatal-Legionnaires-disease.html#ixzz1BLfb4POJ