[Rusty]

Originally Posted by Acres per Second

Those marks looks suspiciously like a Red Squirrel's been chewing on your house! When they have nothing else to do, they gnaw at tree limbs and cut down desirable saplings.

Do those marks appear like a small pair of teeth were dragged across the surface?

I was saving the below photograph for a discussion of Chickadee bird houses; however, the chewing at the bottom of the entry—especially—looks similar to your photo above. Since Red Squirrels have gnawed at the aluminum reinforcement plate—as indicated—I'm not sure I have a preventative for you; however, window screening is the one surface Red Squirrels haven't attempted entry to our cottage.

Very detailed explanation. Good job.