I recall this photo from New York: https://viewing.nyc/nyc-building-exterior-cleaning-before-and-after/ https://viewing.nyc/nyc-building-exterior-cleaning-befor

I recall this photo from New York: https://viewing.nyc/nyc-building-exterior-cleaning-before-and-after/ https://viewing.nyc/nyc-building-exterior-cleaning-before-an...