Mayflies, also known as Canadian soldiers, blanketed buildings, cars, parking lots and just about everything that was stationary.
Whatever ya do.. DON'T squish them... Peeee Yeeeww.
At least hey only last a day or two.. but YUCK!
http://www.cleveland.com/rocky-river...ade_rocky.html
http://www.newsnet5.com/news/local-n...dewalks-lights