OP is including writing “wash me” in the dust on the rear window in “vandalism”.

Did they say so in a comment?
I don’t see it in the OP post.

Anyway, I don’t think of selective cleaning when I hear vandalism.
And I agree with the previous comment, that destroying property is not the moral thing to do.

They’re not sold as ‘hot dogs’ but I’m pretty sure there isn’t a place in Germany where plain old bratwurst in a plain old bun isn’t a thing.

The standard hotdog you can find in Germany consists of a bun and sausage with ketchup, mustard, crispy onions, pickles and sometimes cole slaw.

Where would that be the “standard”?
The most common sausage in a bun combination is just sausage, bun, ketchup/mustard.
Unless you’re specifically talking about restaurants that have an item called “Hot Dog” on their menu, which in turn is rather rare.

And this is when the topic was published by a newspaper.
If memory serves, the fist scientific publications were from the 1880s.