Originally Posted by chc
That is "midge " frass (poop). Midges don't bite, altho some of the swarms are heavy enough to suffocate you. Parts of the upper bay; Back River, Magothy, etc are known for the lil' devils. "Awesome" cleaner $ 1.00 @ Dollar General will dissolve the green specs easily. DO NOT get it on any glass surfaces, as it will etch them right away.
Anchored in the Alligator River in NC, Sept 2015. Dead midges 2" thick over the ENTIRE boat. The pictures below don't do it justice.
Took 6 hours to clean. Blue/green stuff EVERYWHERE. I could hear the air from the 400,000 wings from inside the boat.