This is very typical.
Everything outside gets like this around here, every Winter.
Sidewalks, gutters, decks, fences, siding, vehicles, even the fucking streets.
Anything that is not under cover.
Anything in the shade really gets it.
That green mossy shit is also very destructive.
It will eat right through a paint job on a car, which it did on the Sprite.
It also eats rubber weatherstripping like the ones around the glass on vehicles.
Since it has basically been raining for two months now I see it is really getting bad in some places.
Just one of the joys of living around here.