Where we live on the edge of a marsh the damp climate and preponderance of clay soil seems to be a breeding ground for algae and other green slime.
Not too bad in the dry but the deck becomes lethal in the wet.
So as it was a sunny day I got out the new toy and cleaned it all off. I have no idea how much water I used but a clean deck is worth it.
Sadly, it means a nice sunny day has passed and the Rocket has stayed in the garage. Life is a trade off.