Somebody needs to use a High pressure washer on that outside.............
No need for harsh mechanical methods!
A gentle application of Tarnx, and nothing more.
And if you purchase a Tarnx sixpack...you will receive a free Ginsu knife!!
Most of those old buildings need cleaning after centuries of mold, mildew, pollution and birds.
I’m sure they would look much better if cleaned like when they were new...............