Hi all

Looking for something to help remove the pollution grime from the deck of my boat, it's been there a while. It's notoriously hard to remove and it's also on the nose of my dinghy from storing vertically in the council racks.

Edit: Actually I'm not sure if it's pollution or some sort of moss/algae/lichen (it's black) but it definitely comes from the sky as it's only on the horizontal surfaces of the dinghy and boat.